I don't know I think this is a pretty bad strategy. ONe of the things I found funny about one of my AV raids was this.
There was a guy who was multiboxing (or maybe there were two I don't know) anyways there were 10 shaman on defense. More or less we couldn't get anything done. As soon as we pulled they would run inside and start spamming chain lightning litterally killing 3-6 people every 3.5 seconds.