Yeti Cave in Dreadlands
 

I have been killing Yetis for the past few hours and have noticed once you pull them past a certain point in the tunnel, they will "ghost", spin, and stand still. Meanwhile, pet will beat on him no problem without getting attacked in return.

Just an FYI, since this could be possibly exploited.

bug with latest hot fix for TT zone, everything that roams around is ghosting some of the time