Me and several friends tested this and appears to work,
What I did:
Step1: Joined a celestrial group (oqueue or normal make sure you have assist)
Step2: Disbanded the group just as the tank pulled (Do not get in combat as when combat ends you will be teleported back to your realm.)
Step3. You should now be on the other Realm, you can teleport to vale/relog and you will still be on this other realm/run for i=1,GetNumGroupMembers() do if UnitName("raid"..i) ~= UnitName("player") then UninviteUnit("raid"..i, "reason") end end LeaveParty()
The only way to break this 'Glitch' is to join a party with someone on your home realm