If you've never seen this video before, I wouldn't be surprised at all. I'd say the difficulty of that first cap is about 9 or 10 out of 10, even if you've seen it before.
If you've seen it, I expect more like a 6 out of 10 from this next cap, since it still doesn't show which girls are in it.
ROUND2|CAP2:
Extra clue: The first cap was from near the end of the PV, this one is from the beginning. Oh, and it's from a group that isn't around anymore.