(ABC NEWS) A just-released 911 call reveals the dramatic moment when two Dallas-area teens were able to help save a woman who had allegedly been kidnapped after they saw her mouth the words “help me” from the back of a moving vehicle.

Charles Atkins Lewis, 37, was arrested Aug. 22 after allegedly kidnapping the woman, 25, who has not been identified, at gunpoint and forcing her into his car in downtown Dallas. The two teenagers noticed the woman from their car as Lewis allegedly drove her through Kaufman County, according to the recording.

“Yes, I’m on the highway. I’m witnessing a robbery. Not a robbery, a kidnapping,” Aaron Arias, 19, told a 911 dispatcher. “It’s me and another guy. So we’re checking out the girl in the backseat because we’re like, ‘OK, she’s kind of attractive’, and then all of a sudden the guy is turned back, looking at us.