Well he explicitly said "Dean is confused about what happened at that moment and won’t actually find out what happened then until episode 7," so I assume that's what he meant.
I thought it might turn out there was angel involvement in making sure Cas didn't leave with them, but then it doesn't make Samandriel showing up make much sense. So idk. Maybe he just tripped on a root.
Re: Cas spoilers
Well he explicitly said "Dean is confused about what happened at that moment and won’t actually find out what happened then until episode 7," so I assume that's what he meant.
I thought it might turn out there was angel involvement in making sure Cas didn't leave with them, but then it doesn't make Samandriel showing up make much sense. So idk. Maybe he just tripped on a root.