probably the producer Elliot Kastner or Frank Sinatra had something to do with the deal with WB, or HBO had exclusive rights like FORT APACHE THE BRONX, which carried over to home video. Filmways only had theatrical rights to the film. The old VHS did not have a Orion logo, if I recall...
TELL ME A RIDDLE went to Warner because it was produced by Saul Zaentz, just like AMADEUS, ONE FLEW OVER THE CUCKOOS NEST, PAYDAY etc. UGH was I believe a Lorimar production., hence now a Warner title. Had nothing to do with Filmways
BEASTMASTER is already re-issued on DVD, I saw it on one of them multipacks at Walmart from Echo Bridge.
NEAR DARK is still with Lions Gate via Studio Canal.
HELL NIGHT is still controlled by anchor Bay believe it or not.