Hunkering down to help guard Fate and Zevran around a few corners becomes an increasingly less smart idea the longer the others are gone; it's easy enough to tell from the shouting that they're still alive, mostly, probably, but it doesn't sound like that's guaranteed to continue.

"Andraste's—watch him," he says to Fate, and runs.

And stops

He is so overwhelmed that his face goes blank and sort of stupid—which might be funny later, if any of this is ever funny—looking at the toothy head... thing... that's just crashed into a nearby wall. It's on fire. It launches itself off. He knocks it away on reflex, with his shield, back toward the fray.

Never let it be said that Grey Wardens never contribute anything outside of dealing with the Blight.