The knight can buck its rider off, causing it to capture an opponent 2 spaces away along any file, but the horse is out of play, leaving a pawn at the original position as the displaced rider. Since the king has experience in battle against horses, it is ineffective against them for capturing, but you can still demote to a pawn.
The knight can buck its rider off, causing it to capture an opponent 2 spaces away along any file, but the horse is out of play, leaving a pawn at the original position as the displaced rider. Since the king has experience in battle against horses, it is ineffective against them for capturing, but you can still demote to a pawn.