Apologies if already covered. Didn't see it posted.
I understand tradition and this can lead to copycat/one upmanship attempts, but c'mon.
Other than some additional marching/serious shouting at, is it that serious? Looks like a bored squaddie that can be cured with some remedial 'adult' language.
Completely unknowing about what the soldier's record actually is, so maybe this was his last chance. But if not...
Dancing Buckingham Palace Guard Faces Prison for Protocol Breach
And yes, I would not be amused to see our equivalent - The Old Guard at the Tomb of the Unknown - doing such.
But correcting such with formal punishment for a first infraction?