I once managed to do this to a coworker of mine in person. I was in disbelief, and so were they. Once in a lifetime feeling
I had this happen time three times in a row. Something in my teenage brain just could not comprehend what was happening and I kept on getting hit with it.
Not a checkmate if the knight moves to the space next to the queen, then activates taunt, forcing the queen to target the knight. Bishop takes queen. Simple.
Irl the king would totally try and kill the pawn to survive.
And if the pawn overpowered the king then it's possible the pawn, or one of the bishops would become the new king.