Trent is almost, but not quite able to get fully around the Girralon. Since he doesn't know whether or not the creature has improved grab he takes a bit of a wide arc to get around without getting clawed. Confident that with but a slight adjustment he will be able to swing around to flank with hightower, he stands and grits his teeth ready to take the inevitable.
The girallon suddenly feels very threatened.
Unable to flee with his meal without getting stabbed and raked the furious monster goes on the offensive. It takes a slight adjustment to place Hightower within reach (and coincidentally Trent in proper flanking position), drops Rosa in its space, and lashes out with flury of tooth and claw dividing its attacks against both of those threatening it.
The monster strikes both of them quite visciously with its claws but fails to bite through Hightower's thick armor. Trent suddenly feels woozy and nearly "rend"-ered unconscious while Hightower is severely as well.
On a good note, now that you are up close to it and can look over the damage you have already dealt it, the beast also apears to be barely conscious as well. Both Hightower and Trent are flanking the beast. Rosa is conscious but prone in its square and because it is totally ignoring her for the moment it loses its dexterity bonus to AC versus her attacks.
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Initial attacks:
http://invisiblecastle.com/roller/view/1671775/
Damage versus Trent with rend: 25 hp of damage (if it weren't for his aura, it would have been 31 hp!) knocking him close to unconsciousness.
http://invisiblecastle.com/roller/view/1671797/
Damage versus Hightower with rend: 30 hp of damage (would have been 36)!
http://invisiblecastle.com/roller/view/1671805/
OOC: My apologies for the absence. I can't seem to get on Enworld reliably when I have time to actually post something.