A simple rewrite is to have him infected with a tadpole
and branded with the absolute's mark pretty much just brainwash him, goblins might think they have a new pet bear rather than a pet druid, personally I would have Halsin be a better Druid, doesn't make sense to have a guy who can't control his wildshape to be in charge of the Druids, like what if he goes bear and mauls his fellow druids, if he was infected It'll make the whole bear thing more believable since the Tadpoles seem weaken their hosts, (Wyll and Gale mention that they could cast higher level spells before the events of BG3).
