Five total, but he only does 4 at once.
Initially fighting 4.
This is easy to do with a Druid also if you have Nature's Swiftness. You can start the attack, switch to bear, kill two, switch out, quick heal all the way, switch back to bear, kill two more, then finish everything. It would get tuff with 5, but still possible.
The server I am playing on has some lag, but the game is still very playable and I am enjoying it. Wish the AH lag would improve, but I can play without it. Just means the trade channels will be used more.