"I think so." He can't be certain, and he doesn't pretend - but he knows that's the next bad link in a long chain of them. And it's maybe where things could be prevented from getting much, much worse, if Sephiroth were to get there, first. Before, anyway.

All the Portal talk is just going to make his head start hurting again, so Zack glosses over most of it, but - that last bit catches his attention. His head jerks in an unhappy sort of a nod, as he drops the makeshift ruler in his hands to his side again, tapping it against his leg. "So, that means nothing changes on my end, right? Alternate reality, alternate Zack... There's no saving things for us, too?"