Kick-off return or touchback

[HawkeyeCubP]

I've got it frozen at the exact moment of the catch, and the player's feet are on the ground, slightly in front of his body - body leaning back. It looks like the ball could've been breaking the plane of the goal line right then, but bad angle. Referee has a better look than I do.

Then two more quick clicks of play and pause, and the player looks completely behind the goal line, to me.

It's pretty clear to me, in slowing it down, that the ball crossed the plane of the goal line (most likely, completely across), so it looks like it should either have been:

1. Touchback, or
2. R's ball at the 1/2 yard line, which I doubt too many Referees would do back there. (8-5-2-a-Exception)