I'm pretty sure players lose their lock on the target usually (although most of my fights have been team battles...so I usually switch targets as soon as someone dies anyway). Sounds like a bug in the pets targetting. And you're right...it's not very fair in that case.
Noticed this one in Bloodybay too..
Yup it's a pain- I've watched my mercs run off towards the hero hospital time and time again in Bloody Bay and Sirens. They do it even if you keep clicking the 'heel command, and about the only way to stop them is to just keep on clicking. Real problem when they wander off and you get squished whilst they're away... think getting them to attack another target usually works (though that's not much help in 1 v1 Arena I guess)
I was giving a mate of mine a friendly duel match yesterday, his lvl 8 stalker versus my lvl8 MM and I think I noticed a bug, but am not sure as I've barely played in the arena/PvP.
After he'd faceplanted the first time, my zombies did NOT lose their target lock. They immediately shot off to his respawn site. No amount of him using his Hide helped either, surely this isn't right?
I mean, I liked beating him and all, but I want a FAIR fight, and if my henchmen are keeping their lock when they shouldn't, that's not fair...
@FloatingFatMan
Do not go gentle into that good night.
Rage, rage against the dying of the light.