Questionable NFL officials?

[Runscott]

I just googled 'Dez Bryant three steps' to see if anyone else was thinking the way I was. Here's what I found at deadspin:

Officials reversed the call because they determined Bryant was still in the process of making the catch when the ball was jarred loose by the ground. (Read that sentence again; football officiating as a demonstration in real-time casuistry is the sort of thing that could make even gamblers swear off the sport eventually.) The Cowboys lost their goal-line situation, possession, and, eventually, the game.

Watching a replay from the sideline, it's unclear when the process ends. Bryant takes three steps; Bryant has possession of the ball; Bryant stretches out for the end zone. When Bryant chooses to reach for the end zone, doesn't that complete the process? Do any of us know anymore? Is football now necessarily an exercise in epistemology?