Alright so say I'm on painter and I've combo-ed off. My opponent is on big red so their deck goes to the graveyard. The milled deck has 2x Emrakul, the Aeons Torn and 2x Worldspine Wurm that just entered the graveyard. I'm pretty sure both copies of Emrakul trigger at the same time, so in response I sac Relic of Progenitus to remove them from the game. Does that mean that in the process the Worldspine Wurms are also dealt with or do they trigger at different times?