IC updated. It's five words, but two are short, so hopefully it works.
Of course, the occupants have to be wondering why the people who threw the grenade seem to give it no concern. Well, the ones who fell for the trick, anyway. I suppose I should give them a reason - the grenade will start emitting a thick, light green smoke, rapidly filling the inside of the van. It will be thick enough to lightly obscure vision (Light smoke, -1) so that it is unmistakeable, but doesn't significantly hamper our efforts. Sam and Ace, with their Thermo, should not be affected at all. I doubt it will impact many of the occupants as well, but it is more for cosmetic effect than tactical effect.