Talk:Companions

Halsin follower requirements

Held prisoner in the Goblin Camp. He will join you if he is freed and you did not attack the Grove. He will become a full companion during Lift the Shadow Curse. Halsin can not be recruited alongside Minthara, barring exploits and bugs.

In my playthrough I attacked the grove, saving the Tieflings, but Halsin still helped me kill thegoblins, and joined my camp for the journey to the underdark. 
Note I had already discovered the tunnel before the meeting with halsin back at the grove, which is what prompted him to ask to join my camp.

Minsc recruitment

You have to have Jaheria to recruit Minsc