Possibly the scriptwriters just thought it would be cool.

I'm not really that bothered about logic, I suppose. Though explanations of how they all lived would be nice. I'm probably just peeved about the general fact that Toby died. I like the thought that Toby was fighting the Beast though! Toby/The Beast interaction, that's what I'd like to see!

Toby/Jefferson! Awesomeness! Though the fact that Jefferson was quite willing to shoot him makes it a little problematic...