From what he understood, everyone here was currently human because whatever lives they thought they knew were (supposedly) fake. Castiel of course didn't believe any of that, but he definitely was aware that his angel batteries were not currently in working condition. And if that was the case for him, then Gabriel likely wasn't in full angel mode either. Which he supposed was probably a good thing for the moment.

Cas was tense as his less-than-pleased looking brother slowly came closer, but never once did he waver. He took note of the disoriented way in which his brother was moving and for a moment came close to asking what was wrong with him, but then Gabriel was speaking and Castiel was immediately hushed.

Purgatory. Gabriel was telling him he was in Purgatory.

But that wasn't possible.

"You're wrong." He replied when he had decided that the idea was ludicrous. "This isn't Purgatory. I'm not dead." His knowledge on Purgatory was admittedly limited still, but if nothing else he was sure that he hadn't died since being brought back for the second time.