"Think nothing of it" is not really the typical "pro-stance". It's obviously a risk. it doesn't even matter if the character cannot actually die from the effect itself, he could still die a round later from another enemies lucky hit.So no one has an IC issue with friendly fire? It seems a bit metagamey to think nothing of friendly fire. Your character has a lethal power he's going to unleash hoping it will slaughter his foes yet he thinks nothing of hitting his friend with the same power. Why? Because he knows how many hit points his friend has. There's something wrong with that line of thinking. How is this any different from "I'll leap off the cliff, it's only 20d6"?
The US Army's stance is "our goal is not to minimize fratricide, but to minimize total casualties."
A pet peeve of mine is people who think it's Ok to target party members in area effect attacks. IMO, unless the characters have full immunity from the effects of the attack, then it is never a good idea.
I seem to be encountering several people who think otherwise lately, so I thought I'd see what the general consensus is in the greater online community.
i am surprised by the response of some of the first posters who suggest that friendly fire is okay if you talk about it and agree to it ooc first. i agree with the more recent posters who are saying that what matters is ic.
would your character be willing to put other characters at risk? how will they react? are they okay with that? i think most people would not. i could see some particularly dare devil characters, or a particularly stupid barbarian who doesn't even realize where the attack comes from, but i think most reasonable people would be upset at getting hammered by a friendly fireball.
if you take significant damage from a spell, in character, you aren't thinking, oh, well, i had plenty of hps in reserve. you're thinking, damn, that hurt, and could have killed me.
but at the same time, the decision to do it, or not to do it, should be based on what your characters would think about it. i'm sure certain characters would put their companions at risk and not think twice. and others may just panic and not think of the consequences. it's a situation rife for good role playing.
so i think taking the discussion out of character robs you have some juicy in game drama.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.