Shamelessly copied and pasted from the Regan Spider Walk toy comments on the main page:
Incidentally, when Sarah’s running at Merrin in the tunnel I think I know why she’s flailing her arms like that — it’s a lot like the T-1000 in T2 going through each of his past human decoys as he’s burning up in the fire at the ending. It wasn’t enough that they had William Wisher co-credited (with Caleb Carr) for the “story”; they needed a second Terminator reference. Maybe?
M.I.K.E.