I believe this spell is broken. If used in PVP you get a message say "Not a Enemy" and will not let you cast any of your pets spell on it. And if in a group and in combat you can push the icon and start the timer, but you do not take over control of your pet. I checked the spell and does not say can not be used in combat.
when it was first introduced back in KoS necros (such as myself) use to posses the pet and disarm chest(back when they killed you) and other stuff that was not intended so in true soe fashion the ability was overnerfed to the point of useless. forget it's there, it's useless.