Board Thread:General Grimm Discussion/@comment-108.228.57.237-20170401031930/@comment-27399661-20170403134252

It's the  Schrödinger's cat theory is what happened. That's why the Russian friend's explanation was elaborate, since they used that in the end.

It wasn't a dream or illusion to Nick, the fact that Diana knows what happened. Like when she told Eve you got your powers back this time, then she told Nick that "he" is dead and didn't come back with them.