Zach will be okay with that, he actually prefers that. Though what is she hesitant about? Being his friend? Or friends with others than those three? 

Zach: Yeah but still. Lets not kill anyone while you're sitting by me.

Logan: I would help her hide traces of who did it though.

Zach: You're not helping dude.

Logan: I beg to differ.

Haha. And just think of what else they can find to use.