Infraction: 7. Do not beg for hand-holding.
Message to User:
Your question is answered in the OP. Whichever case it may be, general or specific (such as Valks), use your judgment, seriously.
Think of aoe as more of a priority. Spread diseases>DnD>BB.
What about Desolation? Sometimes I ignore it and spam BB, but I wonder if it's worth it to refresh it while doing AoE on Val'kyrs for example. Usually I try to BS once just before the Val'kyrs come down.