To be fair, if you could throw a barrel at what is supposed to be a challenging opponent and one-shot him, should that be any less concerning than having the same result using a traditional weapon or spell? Seems like a balance issue either way. The goal, I think, should be to have throwing damage as a viable alternative, not a borderline cheat.
Looking at it from the other side, if I threw a barrel at an opponent and it did 1 point of damage, I'd probably be on here asking for a fix too.
