The 4 brothers were on their usual patrol, looking over the city to make sure nothing bad was going on. They were all standing on top of a building, looking down carefully at the ground.

Donnie: I don’t sense any unusual activity yet, dum-dums.

Leo: Patience, hermano.. we can’t let our gua—

Raph: Guys! Look!

Raph points to the ground, they all look to where he’s pointing when they spot you, chilling in the alleyway.