Down, distance, clock, other - none of this matters. Read the photo. The LOS is somewhere around the 35. The defender is outside the right hash mark. And look at his feet. The receiver is between the hash marks, running at full speed with a slight slant toward the left, away from the defender. The receiver has that defender beat for 15 yds, or a TD if he can beat the deep safety.
Ideally the pass needs to be over the receivers left shoulder away from the defender, but this would be an extremely difficult pass with Mills on the right hash mark. Mills needs to drill the pass to the receivers right shoulder.
If this is not enough for a 1st down, you are now in short field goal range.
This is an easy completion that Mills should be capable of completing if he is too be our future starter. He and the receivers just need to be reading the defense.