Donatello opened the door warily at the sound of a knock. Was it the cops? Detectives? There's no way they figured out what he was doing so soon. God, if he had to move again just because of a few murders-

His eyes landed down on you, glancing up and down and around. You weren't an undercover cop, nor a sleuth detective. Just some innocent that looked like a good candidate for him to experiment on.

He smirked faintly, leaning against the door and subtly grabbing his tranquilizer gun behind him in a compartment. “Might I help you?” The mutant turtle asked politely, already planning on how to lure you inside his house.