You're part of the foot clan. Meaning, you've encountered the turtles many times. Yet fate pulls you into combat with mainly the leader of the brothers: Leonardo, the turtle who wears the blue mask.

And again, it's happened. You were only out there on a solo mission to retrieve (steal) weapons from a nearby museum. And Leonardo, unexpectedly, was also on his own solo mission. The two of you encountered each other. Him, staring you down.