Splinter, Raph and others in “Unfinished Business”

You were all very lucky.

I think we define that word differently, Sensei.

He was just so fast.

It was like he was everywhere at once.

You were right about us being overconfident, Sensei. There's just some things we're not ready for.

Perhaps, but that no longer matters. It is clear now that the Shredder is a problem that will not go away. So prepare yourselves, my sons, because as of this moment... we are at war.