“Hey, guys, hold up a minute,” Bobbie said. “Hilly, you have any extra hydraulic fluid in your pack?”

“Yep,” said Hillman, already pulling it out.

“Give my left knee a squirt, would you?”

While Hillman crouched in front of her, working on her suit, Gourab and Travis began an argument that seemed to be about sports. Bobbie tuned it out.

“This suit is ancient,” Hillman said. “You really oughta upgrade. This sort of thing is just going to happen more and more often, you know.”

“Yeah, I should,” Bobbie said. But the truth was that was easier said than done. Bobbie was not the right shape to fit into one of the standard suits, and the Marines made her jump through a series of flaming hoops every time she requisitioned a new custom one. At a bit over two meters tall, she was only slightly above average height for a Martian male, but thanks in part to her Polynesian ancestry, she weighed in at over a hundred kilos at one g. None of it was fat, but her muscles seemed to get bigger every time she even walked through a weight room. As a marine, she trained all the time.

The suit she had now was the first one in twelve years of active duty that actually fit well. And even though it was beginning to show its age, it was just easier to try to keep it running than beg and plead for a new one.

Hillman was starting to put his tools away when Bobbie’s radio crackled to life.

“Outpost four to stickman. Come in, stickman.”

“Roger four,” Bobbie replied. “This is stickman one. Go ahead.”

“Stickman one, where are you guys? You’re half an hour late and some shit is going down over here.”

“Sorry, four, equipment trouble,” Bobbie said, wondering what sort of shit might be going down, but not enough to ask about it over an open frequency.

“Return to the outpost immediately. We have shots fired at the UN outpost. We’re going into lockdown.”

It took Bobbie a moment to parse that. She could see her men staring at her, their faces a mix of puzzlement and fear.

“Uh, the Earth guys are shooting at you?” she finally asked.

“Not yet, but they’re shooting. Get your asses back here.”

Hillman pushed to his feet. Bobbie flexed her knee once and got greens on her diagnostic. She gave Hilly a nod of thanks, then said, “Double-time it back to the outpost. Go.”

Bobbie and her squad were still half a kilometer from the outpost when the general alert went out. Her suit’s HUD came up on its own, switching to combat mode. The sensor package went to work looking for hostiles and linked up to one of the satellites for a top-down view. She felt the click as the gun built into the suit’s right arm switched to free-fire mode.

A thousand alarms would be sounding if an orbital bombardment had begun, but she couldn’t help looking up at the sky anyway. No flashes or missile trails. Nothing but Jupiter’s bulk.

Bobbie took off for the outpost in a long, loping run. Her squad followed without a word. A person trained in the use of a strength-augmenting suit running in low gravity could cover a lot of ground quickly. The outpost came into view around the curve of the dome in just a few seconds, and a few seconds after that, the cause of the alarm.

UN Marines were charging the Martian outpost. The yearlong cold war was going hot. Somewhere deep behind the cool mental habits of training and discipline, she was surprised. She hadn’t really thought this day would come.

The rest of her platoon were out of the outpost and arranged in a firing line facing the UN position. Someone had driven Yojimbo out onto the line, and the four-meter-tall combat mech towered over the other marines, looking like a headless giant in power armor, its massive cannon moving slowly as it tracked the incoming Earth troops. The UN soldiers were covering the 2,500 meters between the two outposts at a dead run.

Why isn’t anyone talking? she wondered. The silence coming from her platoon was eerie.

And then, just as her squad got to the firing line, her suit squealed a jamming warning at her. The top-down vanished as she lost contact with the satellite. Her team’s life signs and equipment status reports went dead as her link to their suits was cut off. The faint static of the open comm channel disappeared, leaving an even more unsettling silence.

She used hand motions to place her team at the right flank, then moved up the line to find Lieutenant Givens, her CO. She spotted his suit right at the center of the line, standing almost directly under Yojimbo. She ran up and placed her helmet against his.

“What the fuck is going on, El Tee?” she shouted.

He gave her an irritated look and yelled, “Your guess is as good as mine. We can’t tell them to back off because of the jamming, and visual warnings are being ignored. Before the radio cut out, I got authorization to fire if they come within half a klick of our position.”

Bobbie had a couple hundred more questions, but the UN troops would cross the five-hundred-meter mark in just a few more seconds, so she ran back to anchor the right flank with her squad. Along the way, she had her suit count the incoming forces and mark them all as hostiles. The suit reported seven targets. Less than a third of the UN troops at their outpost.

This makes no sense.

She had her suit draw a line on the HUD at the five-hundred-meter mark. She didn’t tell her boys that was the free-fire zone. She didn’t need to. They’d open fire when she did without needing to know why.

The UN soldiers had crossed the one-kilometer mark, still without firing a shot. They were coming in a scattered formation, with six out front in a ragged line and a seventh bringing up the rear about seventy meters behind. Her suit HUD selected the figure on the far left of the enemy line as her target, picking the one closest to her by default. Something itched at the back of her brain, and she overrode the suit and selected the target at the rear and told it to magnify.

The small figure suddenly enlarged in her targeting reticule. She felt a chill move down her back, and magnified again.

The figure chasing the six UN Marines wasn’t wearing an environment suit. Nor was it, properly speaking, human. Its skin was covered in chitinous plates, like large black scales. Its head was a massive horror, easily twice as large as it should have been and covered in strange protruding growths.

But most disturbing of all were its hands. Far too large for its body, and too long for their width, they were a childhood nightmare version of hands. The hands of the troll under the bed or the witch sneaking in through the window. They flexed and grasped at nothing with a constant manic energy.

The Earth forces weren’t attacking. They were retreating.

“Shoot the thing chasing them,” Bobbie yelled to no one.

Before the UN soldiers could cross the half-kilometer line that would cause the Martians to open fire, the thing caught them.

“Oh, holy shit,” Bobbie whispered. “Holy shit.”

It grabbed one UN Marine in its huge hands and tore him in half like paper. Titanium-and-ceramic armor ripped as easily as the flesh inside, spilling broken bits of technology and wet human viscera indiscriminately onto the ice. The remaining five soldiers ran even harder, but the monster chasing them barely slowed as it killed.

“Shoot it shoot it shoot it,” Bobbie yelled, and opened fire. Her training and the technology of her combat suit combined to make her an extremely efficient killing machine. As soon as her finger pulled the trigger on her suit’s gun, a stream of two-millimeter armor-piercing rounds streaked out at the creature at more than a thousand meters per second. In just under a second she’d fired fifty rounds at it. The creature was a relatively slow-moving human-sized target, running in a straight line. Her targeting computer could do ballistic corrections that would let her hit a softball-sized object moving at supersonic speeds. Every bullet she fired at the monster hit.