While he may be "redeemed" in the eyes of the general public, and The Ministry, it would be a mistake to underestimate what he was capable of. There was a reason he was leaving his badge, and Potter, behind. He simply had no intention of playing by the rules.  She was likely underfed and dehydrated at best, with the possibilities for a million other scenarios he didn’t want to particularly envision, at worst. Regardless, she was unlikely to be of any help in a fight, and more likely to be a distraction or liability. He would do his best to get her out as quickly and quietly as possible because that would be safest for Granger.