the guy in the first pic,the jumping mutant,seems to be the one with the mohawk.iat first i thought he had a weird head,i mean it seemed at the top were 2 lumps.but now i see it's a normal head with a beard and mohawk.probably the guy from the making of,and he is probably just burned on his face and his head,that's why he looks that way.his suit looks burned too.
and the guy in the second picture has a full set of hair on his hair.also his hair has different coulour.the mohawk guy seems to be blondish..
maybe we think it's a mutant in that pic,but it's just a man,and because of the light from the top of the room and the flamethwrower below him wee see something else.just a few shades of light to make him look deformed.just because he isn't wearing a helmet,and the other guy does,doesn't mean there is no air in the compartiment.who knows what the action might be in that scene,what the conflict is.
now seriously,look closely at the pic,zoom in on it,is it a normal head but with wounds,burns on it?or a mutant?