From a dps stand point, the lb3 adds 60 to 80 seconds of dmg for a 6 second cast. Assuming you arnt mp depleted and Titan isn't in reliably kill able range (5-7%) you get exponential time reduction returns for every dps that stays up, the second healer hopefully gets up in your scenario, no mp cost ale cure 2, so by all means us it.

That said this is something best left to the Brd or sch to do.