Just to clearify: If the Timer runs out, "Black Knight" appears and has to be defeated in order to proceed. "Black Knight" Is basically you, wich is strange. I'am guessing it's because Ivan is schizophrenic and when "action with the Bosses" takes too much time, he can't control himself anymore. I Don't know. I tried to avoid the Black Knight here. Don't ask yourself why I bother with all the respawning "trash enemies" all the time. You need the Energy Cores to buy Weapons...so they are Health & Currency.