They likely only ran 75-100Yds. They shouldn't be too spooked just from that. That's the main reason that it's good to enter in the dark. They probably realized that you weren't following them and just resumed their eating.
I was out @ 2:00 this morning coyote hunting. There were 8-10 deer in the same field as me for an hour. They watched me walk in. Three of them came to within 30Yds. then they all laid down 120Yds away and watched me walk out.
I have a feeling that you'll be seeing him again. If not before, then during the rut!