@BBY_YOD4 "This way you don't feel like its pointless to rush a fight in a gas bomb." But... it really isn't a good idea to fight in his toxic gas? His whole gimmick is the Toxic Trapper. Like you mentioned, his gas deals increasing amounts of damage the more you remain inside it's area-of-effect, and it blurs your vision. But these effects really play well into his whole playstyle, ya know?
Place traps that are hidden around corners and punish players that waltz into them- pouncing while they're vulnerable. Or punish an eager player who tries to chase through his traps- I once eliminated a player at Bunker Without even touching them. And no, they're weren't trapped in a room. They simply kept forcing themselves through each trap while killing themself. (Sad really...)