LAST EDITED ON 02-24-14 AT 11:23 AM (EST)>(It does bring up the question of just where Mallory was when the
>call came in, not to mention how quickly she got packed and under
>contract...)
I saw on Twitter that Mallory and her partner were the alternate in case any of the teams couldn't go at the start, and her partner had just left for Mexico that day when the call came in that Bopper couldn't go. So, Mallory was locked and loaded in place once the call came.
At least it was Mallory. I could think of dozens of far worse choices to keep around as an alternate.
ETA: "No Hand Movement Have you spotted the course element which teams are supposed to memorize for the final challenge?"
Que? I must have missed that (was in and out dealing with kids for parts of the show).