I can’t understand what happend, can anyone explain this?

So i was playing as black, and I was considering some moves to make, when I saw my pawn hold move diagonally, and I really couldn’t comprehend how or why, it’s my last move.

Wow thank you, I just learned something new. I really didn’t know abot this.

Hi,

it's a normal and legal move!
en.wikipedia.org/wiki/En_passant

sorry. had to delete it.

i wonder if his opponent thought he cheated cause he left the game.