I did a 10 man Archavon this week with my team and it was cake. All you really got to do is watch your team when he jumps to them. Make sure you stand with your backs to a wall so you don't fly too far away or have your chars turned alot. If your MT'ing just make sure if that happens you round them up again or turn them at least and bring boss back in range. Pretty easy but you just gotta watch.