Ok, so this is a glitch in Ultimate Mortal Kombat for the Nintendo DS.

follow these steps to do this glitch.

1. Pick Scorpion, Smoke or Human Smoke.
2. Pick any tower, doesn't matter, as long as your able to make it up to the Endurance match.
3. Make it up to the endurance match.

Now this is where the glitch happens.

4. Whoever the first kombatant is, get their health down untill it flashes "DANGER".
5. Now keep inflicting small amounts of damage with the spear move, untill it kills him

If done, then the kombatant should be frozen for the rest of the match.