bet response
SpoilerI'll take that bet. Two bits says he puts in a token appearance somewhere during the middle of the episode, possibly near the time travel areas of the Canterlot library.
video clip response
SpoilerStable time loops are the best time loops. Also I don't see this spoiling the episode at all. We still get to see Twilight in external panic mode, which is distinctly different than her internal lesson zero style panic mode. Plus Twilight geeking out over time travel magic is already the best thing ever.