The battle of helm's deep goes ill for one of the fellowship, will they survive, or will they succumb to their physical and mental wounds

So this is my take on the extended edition scene in return of the king when they meet with the Army of the Dead. What if Legolas didn't emerge from under the falling skulls when Aragorn shouts his name?

Things in Moria go ill for Legolas and he is gravely wounded by the troll during the battle. Will he survive his wounds, who feels responsible for his condition?