Scrimmage Kick/Touchback

[Theisey]

Originally Posted by Canned Heat

Correct me if I'm wrong, but rather than throwing a bag to mark that, you should be winding the clock at first touching by R and then obviously killing it when the ball crossed the goal line for a touchback.

This play was posted as a scrimmage kick, the clock would start on the snap or be already running.
There is no such animal as "first touching" by a team-R player. You are confusing the wind on the touch for a free kick but that's not the case for this play.