Freylla was a widower on the day he received the order to execute Helkosh and his motivations remain uncertain. Whatever his reason, he did not kill Helkosh, but instead freed him into the wilderness outside of the prison. Freylla avoided execution by Vader only because Vader was busy being shot down over Yavin and reforming the entire Imperial Fleet after the disastrous loss of the first Death Star.
When the Imperials withdrew in poor order from Olchark, Freylla was captured and imprisoned where he had previously been a guard, the remaining prisoners tormenting him, blinding him, and subjecting him to high doses of Silver Spiral for their own amusement. He was tortured by "Warden" Needro into giving up many of the secrets of the facility to its new master.
After being rescued by Special Forces Group Effortless in their escape from the facility, he was placed at the Karplan Sector Medical Center where he continues to be treated today. I have interviewed him. He is an interesting character but reveals little about his true motivations...
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