I'm So Sorry [LOU JITSU FIC]

There was a beam coming for him, fast, much too fast. He wasn't fast enough to throw up his ninpo to block the hit. And he remembered utter panic of what that beam would do to him. Wondered if he was going to die.

But Pops had been fast enough. Somehow. Was his dad always that fast? He'd taken the blow.

(X)

TL;DR: During a fight against a new jellyfish mutant, Splinter gets injured protecting Raph and is age reversed. Now, the turtles have to somehow convince Lou Jitsu that he's actually an old rat man who had four turtle kids.