Eldariel grunts; not in disgust at helping Jules, but that the others were missing obvious things to do to help him.
Eldariel waited while the swarm ate the corpse, until it started moving again; then (at the foot of the stairs) stomped his feet over and over, and took one hand, put it against his injured thigh, and left a trail of blood spatter between them and the swarm.
We're bleeding, and those things eat flesh. They should follow us for the time being. We can draw them after us while Jules makes his way out. If you wish to go down after him, fine. Get ready to move fast to avoid them if they come back your way.
With that, he leads the swarm out of the room, and hopefully Aria along with them (ie: if she's not moving on her own yet).