Originally Posted by
Rogge
We have two mages who use nether tempest and neither of us stops putting up bombs while there are two bosses active.
Never had either of us proc either the first boss' cleave or the third one's explosion.
I could have sworn dots/bombs etc did not proc it, only direct damage spells&attacks and possibly applying a new dot/bomb on a shielded target (never tested, we just hold dps while waiting for massdispel on first one, and on the third we spellsteal).
We onetank and always have them close together.