It always sucks when that happens. Had someone do that to a healer who was new to A4 once...told him to "just heal" without anything beyond that. Naturally we wiped again and again and...vote abandoned. :/
The others covered the big mechanics for levi, but If you ever do it on extreme, there's another thing for healers: you want to stay away from the rest of the group since there will be an AoE originating on you. But yeah, definitely can't ignore those mechanics.







