But upon watching the replay U2 was acting like he did not see anything.
That would be Brian Gorman, who acts that way all the time. Hustle is not in his vocabulary.
(Note: In a 4-man crew it's not the second base umpire's call on such a fly ball when U2 is in the infield. My lack of hustle comment refers to the many times I've seen Gorman look totally lazy out there.)