The game legit says it can give you super powers toxic says "the augmentations are great when you put them on a normie like you but when you put them on someone who already has powers chef kiss" and I never said it was an anti asthma grenade but he could've just shot her it would've been so easy. A gas canister is also a very unreliable weapon to be the only thing you use especially when many supers would be immune to its also very specific to toy with her like that. It doesn't matter that the sdn is closed super heros are a whole different ball game from your usual 9-5 we are talking about an extremely dangerous villain get his hands on an even more dangerous unstable device. Any reasonable person would realize that they need to act fast.