Having thought to have taken out more diver than he actually did, Joseph Leidner did not expect a punch the moment he ran out of the door. As such, the punch hit hard, temporarily knocking Joseph out. The momentum of his body carried him to the wall opposite of the cabin door, where his body came to a halt.

Waking up shortly after, Joseph had a headache. He opened his eyes just enough to make out the locations of the divers, that were fighting him, to make sure they were in the area. Mr. Leidner then mumbled: "A mass beyond compare / Pulling in and out / Ripped apart by the tide! Tidal Shredder!". It wasn't a quiet skill, especially as parts of the hallway's ceiling and walls were also within the affected area, but Joseph did not care. If the ceiling collapsed on him, he would at least have some silence to recover from that punch.

In hindsight, letting a ceiling fall onto you isn't a good plan, but the headache didn't allow him to consider that at the time.