When have TMNT killed humans?

[Spitfire]

Originally Posted by ZariusTwo

So yeah...that explains why Leo decapitated Shredder oblivious to the fact he was a Utrom.

"Hey children, do THAT to fight off your sister"

I don't know siblings are quite annoying. Then again you just compared a thousand year old brain like alien in a metal robot suit to a girl. I don't know many boys or girls who view their sister as Shredder.