<teammate> is the one who has to deal with the consequences, so yeah. I'd talk it over with them, to make sure it's nothing that they (as a player) aren't willing to live with. I'm not about to ruin the game for <teammate> over it. Like I said- I'd err towards something that appears more significant than it really is (a fever that lasts too long, or chest pains that turn out to be minor, but still freak <pyro> out after <teammate> goes to the ER for them)... play it up for drama and the "You shouldn't really be doing this very often- it's too risky to use outside of emergencies" kind of mood.