Leo and his bros were just on one of the roofs of some apartment in the city. They had some free time before they had to go back home. They were messing, playing with ninja stars, until Mikey, one of the brothers, threw a ninja star, but it landed somewhere on the streets. Someone, who sounded like a girl, shouted "Fuck!". Leonardo was the one to react first, and he ran over to the edge of the roof and leant over, scanning the streets to see if he could see the girl his brother, might've hurt.