Constant spell interruption while holding down right mouse button

[Skarthe]

You cant "turn" and "Cast" at the same time.

A valid mechanic to avoid being the target of a spell, is to walk behind a mob mid cast. It's unable to turn, and therefor is interrupted.

I would assume the only reason u hold right click, is to turn.

Pretty sure this is correct. Adding to it, if all you want to do is turn your camera, use the left mouse button instead of right. Left controls camera, right controls character.