Shredder and Leo in “Unfinished Business”

Why does the fly walk into the spider's web?

Because all the spider's henchmen are out.

Ah. You wish to make a trade?

The helmet for Karai!

Very well. She'll have to be brought up from the dungeon.

You raised her from infancy and now you lock her in a cell? How can you do that?

In any conflict, the winner is prepared to do what the loser is not.