I may add that as a future thing, thinking about it. It gets revealed perhaps, and would be an issue. No doubt, it could make a big difference- and definitely negate Ellie. I think that could work, for sure. 

Don't worry- I would just say, keep in mind that it's almost like it's own spacecraft. It's a pressurized environment, and it's described by some like a blimp- something being pumped full of oxygen, of course. 

And yeah, that can work. Maybe what occurs to Ellie is what happens when she goes out upon seeing him (to recover him), or perhaps the rest of the group further along? The thrusters wouldn't have much fuel, and as well as that, would be needing minute quantities. In theory, once you're moving, you're moving- hence why Ellie didn't want the team using them much, only if they needed to bridge a gap. But more would be wasted recovering Viktor, so again, tensions flare...it will get far worse than this.