Continuity mistake: When Solara hijacks the SUV after leaving George and Martha's, there are mountains that disappear from shot to shot. Right after Carnegie yells "Go back," you can see mountains in front of them. When Solara gets out and looks at them turning around, those mountains are gone. After she grabs the grenade and stands in the middle of the road, they are back. When she throws the grenade and Carnegie's vehicle swerves out of the way, the mountains are gone again. (01:27:30)
Continuity mistake: When Eli is leaving Carnegie's town, as he walks away from Carnegie and his gang right before the shoot-out, the position of their shadows alternate drastically between shots, falling sometimes in front of the characters and sometimes to the side.
Answer: Most likely, Redridge is giving Solara a chance to escape Carnegie's regime. At this point, he knows he's dying, but perhaps still wants the best for her. Remember, he had a crush on her the whole movie (blocking her while she was getting Eli's canteen filled, bargaining with Carnegie for her before chasing after them, even asking Eli nicely to give up the book after the gunfight in the house). I think it may also have been used as a self-redemption moment for one of the bad guys.
Jason Sieberg