Could always try rooting/snaring tarnuk, moving his adds away then snaring them both then evacing druid and tag tarnuk with other or wait for druid to get back. Also even if you do katta like I suggested, I would still do BP camp for the clickies some classes get pretty decent ones.
Shaman gets a clicky to lower chance of resist by 40%(very useful on the more resistant mobs):
Paladin(I don't have it) from what I understand the clicky is a defensive buff that stuns things like WoT would heal you:
Druid gets a big DS:
Monk gets a clicky dispell(great for pulling and only 30 sec recast):
Mage gets a pet HoT for 100hp a tic for a minute, and it increases damage done by pet:
So obviously some are better than others, but in my experience he does not just drop the one you need most the first time
