Sure, we can break it down. Surprised it hasn't already been done.
Here's the image that caused folks in the stands to apparently lose their collective ship:
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And if you knew nothing more, you might think that's the ball in his right hand, reaching across the 40-yard line for a first down.
But other angles clearly showed the ball was actually in his LEFT hand. Tucked down in his gut. Roughly on line with the red line I'll add here:
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And that's where the refs spotted the ball, more or less. I mean, it doesn't matter if the ball was a half-yard short or a full yard short. Turnover on downs, either way.
Oh, and by the way, this screen capture is already a spllit-second late. When the player's right thigh touched the ground, his right arm hadn't yet gone forward. In other words, he was even further back than this. Not a lot, but enough.
I didn't find those other angles that showed the ball near his belly in his left hand. But they showed it clearly during the delay, a few times.
The refs made some bad calls in last night's game. This was not one of them.