Healers are expected to help cause the Concussed condition and to run Blockade of Storms, which guarantees that Concussed will turn into (also) Off Balance.
If you put 75 points into Thaumaturge, you get Exploiter, which boosts damage against Off-Balance opponents.
I get all that, and could probably look up the details to flesh it out. (But if somebody wants to post them from memory, that would be great.)
Where my knowledge breaks down is with respect to durations and so on. How long does the Concussed condition last? How about Off Balance? What do the references to Off Balance being "consumed" by heavy attacks mean?
And of course -- what else should I be asking?