I think Ink was turned. Unless we get a secret Ink Journal that they find, odds are that we will never have 100% no shadow of a doubt proof. I just find it odd that if he wasn't turned and such, why did he wait for 30 min before he got out? If he knew he could control them before hand, as soon as the screaming stopped he would have hopped out and went "Awesome. Lets go" not wait for 30 min and kick open a door. Even if it were locked we know he control them with verbal commands at times. He told them to stop with CJ. He could have went "Open the Dang door". Instead he waited. My guess is that he had a turning period. Slowish. That 30 min was him turning.

Side note: Any thoughts of Wind? Like the Haze traveling via the wind? No clue of how windy it is around those areas. Maybe that is how it moved so fast (If that is what turned ppl). After a certain distance it was just not thick enough. Like smoke from a fire.