Vampire save game glitch
Apparently the level I played on had an imprisoned neutral Vampire that went feral after loading a savegame in the same session. I found him running around wildly, was unable to contact him to recruit or cast Thunderbolt on him, but could blast him by Shockwave. Even after capturing both prisons he is still imprisoned and there is no way to either get rid of or convert him.
I can validate that this is happening on the Public Linux version as well.
I attached my save file where this is happening.
stonegate_netural_vampire.tar.xz