The cage lasts through three attempts by the shades to get through. It dissolves with a crack of thunder and the monsters are free to attack the Templar holding the line.

Fire leaps up from around the Templar's feet, leaving him completely unscathed but forcing the shades back. Of course, it's Dorian who's responsible for it. The point is to keep them back, create openings for the Templar to hack and slash at them.

He picks one out from the crowd and turns it into a walking bomb, the shade crackling with the spell that slowly infected it. Given time it would explode and pass on to the other shades.