When fighting the Hag (Auntie Ethel) I was able to stealth/hide my party and engage her on the bridge using the grease spell. When she was engaged she targeted the mage which allowed me to use the rogue to continuously sneak attack her until death. She never engaged any of the party members and would walk slowly away until she ultimately stopped as I used sneak attack.
At the time of this writing I did not know how to bypass the poison clouds in her lair, so I used the jump option to hit ledges in and around the area to avoid it.
I also utilized the wizards fire spell to explode the poison, but it kept coming back regardless.
