unkillable Doryani

Hello, today i was on a tier 15 map at doryani and in the first phase he got to the 5% level of life when the culling skill activates and then i tried the culling skill several times, meanwhile doryani kept attacking me until i died. Now i understand the game is in beta but how come no good bugs for the players only bad bugs for us. Anyway, i want my 8% xp i lost and my drop. Fix this for me. Thanks