Nearly impossible, making the best photo

[misol]

I am shooting for some camps and last week I got the challenge and joy of shooting inside a fire training survival house.

Nearly no light besides some low blue light, and one low red light in another location. *Very* low light, to say the least.
Close quarters (i.e. "caved in" roof).
Fake smoke (flash reflects off it)
Fast moving teens trying to break records

I got some fun pics last time, but another shoot is Tuesday with a different group.

I have a 5D MKII + kit lens
85mm /f1.8 IS
70-200 f/4L IS

430EX speedlite (I think)

So, I totally get I am not going to get high quality shots, best goal is fun shots...where you can actually see the kids face.

Any ideas?