I just want to make sure I have my facts straight: Mom takes her 8-year-old daughter and two other children to Walmart at 11:00 at night, makes friends with some strange man there, then simply hands her daughter off to her new friend so he can buy her a snack??
I would say that it's rather unusual for a child to be at Walmart at that time of night, so not a very opportunistic hunting ground for an RSO ... unless he was conspiring with someone to meet him there. It's a HORRIBLE thought, but, unfortunately, not out of the realm of possibility.
Just my opinion.