Then, in tourney mode, you fight the next paddle. In P2P mode, you go back to attract mode. It's not wise, but certainly entertaining. I am not held responsible for lost of cash or lungs. However, the moves for these are hush-hush secrets.
All sequences are FOUR keystrokes long.
If you know the sequence is right, try holding down each key a little longer, and making sure you pause between keys. Try to match your favorite MK moves or variants of them. Fatalties sometimes are variants on the missile weapon, and vice versa. Also, there are secret characters. Listen to Monolith's taunts.