I'm a bit confused, is the crow god here or do we just hear it's voice? Because Narthian had no target to shoot at.

He pulls his kerchief from his pouch ready to gag the boy, and will then look at binding his hands & legs.

With one untried boy and two trained fighters, there is no particular contest.  Whatever power the crow has imbued in Bralton, it apparently has not given the boy divine strength, defenses, or combative magic.  Or at least he's not doing any of that right now.  With Bruenor gagging the boy and holding his arms as Volsh sweeps his legs out from underneath him, Bralton goes down easily.  He goes limp when captured, his red eyes closing, his body going slack.  Most of the villagers, including Bralton's parents, sag to the ground as well, making Ethrain start and jump back.