I'm really excited for this show! I've been dying to see Vader for a long time (I kept missing their numerous tours) and Immolation is great too. Now, while I do like Vader more than Immolation, I think it's stupid to leave before they play. I honestly don't get why you would leave unless you had to. Immolation and Vader are both great death metal bands, so why would you only see one and just go home? It just seems like a waste of money.
So if you're going to this show and you leave before Immolation, you're an idiot.