Mouse was returning from a delivery as he heard an explosion. He was about to shrug it off as another fight between Ranma and Ryoga until he saw Cologne rush over the rooftops toward the general direction of the explosion.
Mousse arrived at the Todo dojo short of breath from the strain of trying following Cologne. Once his myopic eyes fell on the form of the brutalized Shampoo he attacked Ranma in a fit of rage. After a vicious beating Mousse was left with four broken ribs, a concussion, internal bleeding and his nose would need surgery. Wanting to remain there to listen to Ranma's story, Cologne pressed several shiatsu in Mouse and Shampoo that would make them remain unconscious until tomorrow.