This is a long shot, but I read something somewhere (possibly 3rd party) that was some kind of effect be it a spell or ability of some kind and I need help trying to find where I saw it - here goes:
It was something involving planar combat where an attacker engaged in combat with an outsider forces the outsider to their plane, and jumps to an outsider's plane during the combat in order to permanently kill it. When the attack/combat is over, the attacker is returned to the spot they were in when they started.
Again, I have no idea where I saw it, and I thought I had notated it somewhere, but I didn't. Any help tracking this down would be appreciated. Thanks.