Apparently the issue was that Geathers was supposed to be the center, since he's the gunner, but was injured in the second quarter. Whalen had never practiced this play and it's not in the playbook. Pagano ran the play with a center that basically had no proper knowledge of what to do. This whole play is predicated on the D substituting and getting caught off guard. That didn't happen and, as Herc pointed out, Pagano was basically pants by Belichick. Stupid all around by the Colts on that one.