Guys please check this theory in the link below. I find it can be possible a little bit but then I remember the hand shake part.

https://www.youtube.com/watch?v=590v4FCm6WU 

And I was wondering why they didn't show us Brett Partridge's dead body. He just whispered tiger tiger to Lisbon then she gets up and someone take her from behind.
Is he really dead ?!!!!!!