Did Barry Flash out of there in front of him? If so, I missed that.
When Zoom ran off with Henry, Barry unthinkingly sped out after him, a trail of Flash lightning following him. The final shot of the scene held on Wally as he looked back at Barry's suddenly empty chair, a look of realization dawning on his face.
But something does not add up about that. The man in the iron mask seems way too skinny to be John Wesley Shipp.
That's because they wouldn't pay the actual actor to appear in a scene where his face doesn't appear and his voice isn't heard. The guy in the mask is an extra, so he won't necessarily be a perfect physical match for whoever the character is supposed to be. (Remember how everyone thought that the guy in the Zoom mask was Shipp because of the shape of his eyes and his bone structure? Turns out it was a stuntman named Ryan Handley. It presumably still is Handley when the mask is on.)
Also it appears the 1990 version of the Flash exists on its own Earth. Would that mean John would play 3 different characters? I LOVE John but that would seem a bit contrived in order to get him to play all these different characters.
It's not officially confirmed that that 1990 Flash is part of the Berlantimultiverse. Sure, it was suggested by the glimpse of him we got in Barry's dimensional crossover, but that could've been just an in-joke. Everything beyond that is just fandom jumping to conclusions.