I know I'm not the first to have figured this out...

My new favourite way of infiltrating bandit camps is I use the Crucio spell on someone, and then I strike them a few times basic strike, with talent Crucio master it spreads to all enemies surrounding cursing them also,

Finally the talent 'Avada Kedavra Mastery` Instantly kills all those cursed, .... Lol I'm doing quick work of those camps now...