I was in a small group of horde that did this a couple days ago. We had 2 mages, me and maybe a hunter. The mages and hunter did their thing and I mopped up the rest. We had to have killed half the alliance zerg and no more than one or two bothered to dismount to help.
The alliance truly are pathetic when it comes to pvp and having each other’s back. If you shut down a portion of that zerg they’re helpless.