At the part where they jump out of the watch tower onto the tree the one in the blue tank top walks along the branch a few steps, take notice she is walking across only one branch, she then steps back up against the tree (still on the same branch) then the mountain man appears next to her he swings the axe and it cuts through her mouth then it cuts to a shot facing down, notice that the branch she was stood on has gone and there are two either side yet remember she only stood on one and went straight back staying on that one branch.