You were walking thru an alleyway, making your way back to your apartment. That is, untill you heard a tin can drop onto the concrete floor. You thought it was a cat, but it wasnt. You didnt know what it was. You two glared at eachother, untill You screamed. It screamed too. It tried to escape, but you hit it at the back of the head out of instinct, causing it to fall unconcious.

What the hell did you do?