Caustic Lore
Alright, so I just had a moment when thinking about the lore of Caustic and stuff. So, as revealed by the devs recently, Caustic gas is corrosive, which explains why it damages Pathfinder and other...
Forum Discussion
@Sir_Named He actually has little windscreen wipers on his goggles, that you can't see in game, but they let Caustic see better. The goggles are attached to the mask, and he was too lazy to remove the mask with scissors, so he's stuck wearing it, and stuck with the mask that he doesn't actually need.
"I think his mask is more like Bloodhound's mask, where his respiratory system was damaged beforehand and he needs a mask to filter the air. Some people have speculated that Caustic suffered from some respiratory disease in the past, possibly cystic fibrosis. Or, it could be something entirely different, but who knows? We'll have to wait until S5."
Caustic has laboured breathing, more than just the fact he's wearing a respiratory mask, I can confirm this as i've actually worn a gas mask before on a few occasions. He also has also has speckles of blood on his shoulder, you would assume its an enemies blood but i think its more likely that he has coughed it up.
I think you're spot on with the theory about his respiratory system, perhaps he was exposed to an earlier batch of the gas he uses today?
