My sibling (host) and I (client) were running the beginning of the story for them. After the second cutscene of the fight, when the sparrow attacks Lady Deora, the visual effects of the sparrow persisted for me, but not the host. After the fight was done, when Garren Rood and Lady Deora stand side by side, this visual bug persisted this same way as well.
#"Torment Stag" boss fight visual bug
trail moth