Assuming Ernie Adams is the guy radioing down to throw the challenge.
With 3:46 to go in the game and the Pats leading 17-15 and owning 2 timeouts Eli hits a 38 yarder up to the 50 yard line.
On very first quick review it was crystal clear it was a catch, possession, and feet in bounds. No extra angles needed.
Out of desperation the Patriots challenge on a wing and a prayer costing them a timeout with a VERY poor decision.
2 me it was a complete giveaway of a critical timeout.