April, Splinter and others in “Unfinished Business”

Sensei, I want to apologize for the way I spoke to you earlier.

No need. You spoke what was in your heart. I am just relieved you made it home safely.

What's wrong, sensei?

I learned some things from the Shredder.

Like what?

That is a story for another time, Leonardo. Tonight is for celebration. After all, it's not everyday you save the world from an alien invasion.