Boss encounter bug

Vazruden the herald, last boss in Hellfire Ramparts. You encounter the boss, he hops off and comes at you. You get him down to somewhere less then 50% and then he runs and gets back on and then they go over right by the loot box. You can attack and they run to the middle of the platform, reset, runs back to by the loot box. The server becomes unresponsive then eventually crashes.

I have compiled a core a few times now with little or no problems and can get it running, public, with a registration page. i have barely learned any c++, need to buckle down and learn more.

If someone could give me an idea on a place to start i would appreciate it.