Thats a tough one. Drew Brees would have spiked that ball. The whole idea is to save as much time as possible so "spiking the ball so quickly" is the objective. That's 1 minute drill 101. It was just unfortunate that the refs missed the call.
Like someone else said, If Landry gets up and runs for a TD, I'd bet good money they would have said he was was touched down.
But this game will be great for film review and getting the team dialed in.