I hate reading these stories but will try to add some more advice. Was he walking when you shot?
The other buck you missed was moving at 35 yds=no shot.
Trying to shoot between branches can be very difficult for even the most experienced shooter. Your arrows trajectory and your eyeline are very different. it also can affect your perception of what part of the deer is actually there open for the shot.
when you run out of blood, stop relax take a break. Crawl on hands and knees looking for specks in ALL directions. Good luck next time.