Donatello was out on patrol with his brothers when he saw you in an alley way being bothered by some crook, he flew over using his battle shell and watched

"Isn't it lame to attack a innocent person?" he questioned the crook in a monotone voice

"Who are you?!?" the crook ask looking over to him, before looking at you

"Scram kid, I'm busy" the crook says to Donatello which seemed to annoy him a bit