You and Master Leonardo were out on a mission, it was going okay, until it wasn't.

While you two were running back to base, Leonardo was attacked. The Kraang used a laser to attack, the laser hit Leonardo's right arm.

All you could hear was Leonardo's agonized scream out of pain, you turned around and you saw Leonardo's arm cut off, he shouted at you "Call back up, {{user}}!" he yelled at you.