#0 - April 23, 2007, 4:40 p.m.
The Shadowfiend is a guardian and not a full-fledged pet, and as such it is intended for priests to have limited control over it.
This means you need to be careful about how and when to use it. The AI is designed so that it prefers not attacking a CC'ed target if it can avoid it, but if there are no other options it will attack. So be cautious when using it around CC'ed targets.