AV Only - Call in the Calvary

Not sure if this has been posted, but it's possible to have a 40-man AV group and STILL summon people into AV via the Warlock's Ritual of Summoning spell.

Summon your entire guild go Buck wild. If you can get a warlock friend in no more waiting on queues!!!

How is this supposed to work.. AV is in an instance and you cant teleport people from the outside into an instance.. Oo

maybe this works only for alterac or the Bgs..

or it is possible to port ppl cross instance (from 1 instance, e.g arathi basin or blackrock)