Splinter, Raphael and others in “Unfinished Business”

You are losing your fighting edge, my turtles. Were it Shredder who attacked you, he would not be so lenient.

Aw, come on, Master Splinter, we already sent chrome-dome and Krang to the Earth's core.

Yeah, right. Those dudes are totally dusted.

Without positive proof, it would be unwise to assume that Shredder and Krang have been vanquished. Beyond that, may I remind you that you are still crime fighters, and that the streets of this city are still filled with crime. I suggest doing each ninja exercise twice. You obviously need the practice.

Well, you heard Master Splinter. Let's do it!