Ginko is not poisoned, does not need the cure, and has little interest in... hot tub parties or whatever to begin with.

He does, however, feel obligated to make sure none of these dumbasses drown, seeing as how he's pretty sure there's no way to actually deter them from making bad decisions here.

So he's just kind of sitting off to the side, wrapped up in his coat and scarf, frowning around a cigarette.

Does an irritable deer man count as a lifeguard? Probably not, but he's here and ready to pull anyone out that needs to be pulled out.