Weird pet behavior

[Sabin76]

So, I've been grouping with another mage in Najena for the past few nights and we've had some very "interesting" pet behavior happen. I've set up my attack macro very simply: /pet kill. He had his set up, originally, to assist me, then /pet attack. More than once, this sent his pet in the exact OPPOSITE direction occasionally aggroing about half the zone in the process.

I'm just not understanding what the hell is going on with his pet. I've never had a problem with my pet attacking something random. He even claims this would happen out in the Karanas, where he would tell his pet to attack, and then it would go hunt for the largest mob in the zone!

It was so bad that his way of getting his pet to attack if I've already engaged the mob is to cast a low level nuke, walk into the fray, and wait to get punched in the face. Needless to say, this is suboptimal... especially because he has one tier above me in pets, so his should be the one tanking.

I guess my question is: has anyone else experienced this kind of pet behavior? If so, what was causing it? I've told him to change his command to /pet kill, and that's worked for the couple of times he's sent his pet in first, so I imagine it has something to do with the commands he originally had up... but it's just so weird that his pet would charge the jail from the crystal room when telling the pet to attack one of the magicians in there...