K.K. Downing (ex-Judas Priest) returned to the stage for the first time in 10 years during the Bloodstock Open Air festival in Derbyshire, UK yesterday (August 11). The guitarist joined Ross “The Boss” Friedman (ex-Manowar) onstage for some covers of Judas Priest’s “Green Manalishi,” “Heading Out On The Highway,” “Breaking The Law.” and “Running Wild.”…