In The Deadmines, on the second boss "Sneed's Shredder" there is a little bridge like thing in the center of the room. Once you gather mobs, just put some aggro, and jump over to the other side, and the mobs will not go straight after you but go around to get you. This could prevent things from hitting you, which means less healing which means easy fo boss kills and mob killing..
Have fun =) Here are some pictures.
Gather up Mobs
Jump to the other side. And they'll run around.
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