I wish this did happen. It be karma on seeing their prank backfire when this old man chases them, seeking to defend Rainbow’s honour. Zero blood and gore. Besides, shame be more fitting than death for such betrayers. I see them getting a big haircut with their manes and tails shorten.
It also be funny if he shock them; an old man who’s zero frail or slow including when he chops through the door as if it were paper. And to hear him call them many adjectives of liar and betrayer including ‘deceiver’.

Wish this did happen. Especially to see the old man being strong, quick and fiery for his old age.

It be nice if the old man was angry because the ponies prank Rainbow. He meant well and sought to avenge Rainbow’s honour, seeing their act as treachery. And I can picture the pony’s shock on an old being zero as frail as they thought; still able with a sword and very athletic for his age.

Uh, oh. They ticked the wrong man. He’s old but still fiery. And still handy with the sword.
This be the problem with pranks. They tend to backfire including when they bring out the anger of some.