if you recall your training practice doing quick stops, at least in EASA world, your instructor will get angry if any of the following happen
1/ if you altitude fluctuate during the flare either way (loss of altitude or ballooning up)
2/ if you keep the flare too long and the aircraft feel like sitting on its tail toward the end
3/ if you don't terminate the manoeuver with a nice controlled slow forward hover to the ground
in this video, I see all three points to get slammed by your instructor.
I think the pilot was already trying to save a lousy setup,
wind might have been slightly on tail = landing termination come sooner than expected = more flare to recover and no leveling to trying not to overshoot.
it was time to go around