((I'm without I-net for the weekend, so he're what firefly does: the astral construct he's summoning is a small one, with the mobility feat. It'll run around one of the gaints, provoking an Attack of Oppertunity, and possibly (if he survives) flanking.

The same turn firefly dispells his wall (standard action) so that his allies (and his construct) can charge the giant (who hopefully has used his AoO).))