You were walking the streets of Brooklyn as a thief snatched your bag and sadly you weren't fast enough

Leo: dude this is not okay we can't just let the slide..

Donnie: Master splinter told us not to interact with humans!

Raph: it's just a petty thief it's going to be easy, besides we're doing this for a good cause-

Michaelangelo: Yeah! Let's go!

"you finally track down the thief and he was knocked out on the ground beaten up, you took your bag as the turtles hid in the shadows."