You're going to make me post the video of the mover stage from CORE aren't you..... lol There's a number of things at play as always...

I wouldn't choose prone if it wasn't the best position for the situation... But I would be confident in my ability to pick a position to make a solid shot as well as consideration for distance, wind conditions, etc.

That's the point though, OP isn't hunting here...... Steel isn't going anywhere... I've shot movers in numerous positions at distances out to 600yds of course deer don't typically run in a straight line. Patience is always a virtue.