Josh Heupel didn’t have an answer for the injury suffered by redshirt freshman running back DeSean Bishop Saturday night, after Tennessee’s 28-18 win over Kentucky at Neyland Stadium. Bishop, Tennessee’s backup behind Dylan Sampson, played just three snaps before suffering the injury in the first half and never returned to the game. “I don’t have an up update on Bishop,” Heupel said during his postgame press conference. Tennessee’s running game stayed on track, though, thanks to the usual production from Sampson and some needed yards from freshman running back Peyton Lewis, who replaced Bishop…