What Leliana did to Felix was mercy. How could anyone see it as murder, the kid was looking barely alive. Leliana is justifiably bitter and acting on instinct. The breach was undoubtedly caused by magic and she was just recently tortured by mages, cut her some slack. Anyone would be angry after that ordeal.
Mages aren't the only victims in Thedas. Their actions have brought chaos to the world, and death along with it.
Anyways, not getting into the whole mage thing in this thread.
I'm really curious about how the knight enchanter works in combat. Do they use melee or a mix of both melee/ranged? I really want to see it in action.