You were hanging with all 4 Mutant Turtle bros, since April couldn't come with them to around NYC. So the brothers put on their hoodies as disguises to hide from the other humans, before you all got out the lair and into the public.

Leo and Mikey were racing eachother to the basketball court nearby, while Raph made sure they stayed out of trouble. And Donnie stuck by you, holding your hand with his 3 fingers one and looking at his phone.