UMK3 Genesis critical bug

Genesis gamepads have “mode“ buttons. Player 1 can trigger “up“ during the input of any special move for player 2 by pressing “mode“. Pressing “mode“ will not make player 2 jump, but his special moves can be broken or performed by player 1. For example, you can press “mode“ 3 times and a player 2 Shang Tsung will be morphed into Nightwolf.