Okay, sure, he takes off his existing boots and ties them to his belt real quick while he watches the nearest person for how to put on the weird spaceship boots.

The boots are very easy to put on—well, they're very easy to put on if you know how velcro works, but that shouldn't be that hard to pick up. You tap your heels together to activate the magnets that will hold you to the floor even in microgravity.

He can follow this process after seeing it done.

They reach the end of the corridor, climb a ladder, go down another short hallway, and end up in the ship's main hold, a single vast room that could contain the entirety of Worldwound Fort #11, or, more to the point, the smaller gunship that it actually does contain.

It also contains some unfamiliar troops in black armor, wearing strange visors that distort and obscure their faces, who start shooting the moment they see the evacuees. The three marines who didn't stay behind immediately respond with their own burst of fire. 

Fuck. They're all going to die.

"We need to make it to that ship," he tells the group. "My men will cover you. Just keep moving."

He doesn't have to tell Blai twice.

They run for the ship, the marines shielding them with suppressive fire. No one is hurt, until—

A ricocheting bullet hits Blai in the lower leg and shatters his ankle (which he can fix instantly) and the control circuit on one of his mag boots (which he cannot).

This time there are no handles on the ceiling, because the ceiling is more than a hundred meters away.

Well, he can fix it but since he doesn't seem to need to immediately take any steps with that ankle he'll wait a bit in case he picks up other injuries or winds up in channeling range of anyone who does. While he goes flying he'll cast a Prayer in case that helps turn the firefight.

His marine escort pulls a device from his utility belt and fires off his tether, which is designed to magnetically attach to a buddy marine's armor. Unfortunately, Blai isn't wearing his armor anymore, so the tether will hit him in the chest and bounce off. With Prayer and Guidance active he can probably catch it, but it might cost him a few seconds of flailing.

It looks like the rest of the group is almost to the ship, so the firefight will be over soon one way or another.

He can guess what the tether is for and grabs for it.

As soon as he catches it his escort reels him in and—just carries him the rest of the distance, there's no way he's going to be able to walk it.

Someone has powered up the smaller gunship and its own guns start moving, which is enough to send most of the enemy troops diving for cover. Blai and his escort make it up the ramp and onto the ship without further ordeal.

"—full access to all systems for all persons now on board," Lieutenant Lopez is saying as Blai reaches him. He's sitting slumped against a console, an enormous bloodstain spreading across his abdomen.

The damage is somewhat less visible than someone unfamiliar with guns might be used to, but he's still pretty obviously dying.

(Access granted, says a disembodied female voice.)

The blood's a hint! Blai grabs his holy symbol and channels. Good thing he waited on the ankle, this is so much more efficient.

He inhales sharply as he's instantly healed from the brink of death to full health. His first thought is not really in words but is somewhere between Holy shit, there is a god! and Praise Iomedae! except that he does not, actually, currently remember Iomedae's name. It's not his first time having divine magic cast on him but healing is really a much more traditional religious experience than Share Language.

His second thought is that giving an MCRN warship to a random bunch of deserters and terrorists seemed like a reasonable and non-treasonous idea, under the circumstances, when he was definitely about to die, and now seems like it's about to make things...complicated.