No, of course not. I wouldn't be risking my life, but the life of anybody in that Waffle House (or around that area) that could be caught with stray bullets.
The likelihood of anything happening to her is so astronomically slim. Unless she was pulling into the parking lot at that moment, I don't see how he would have harmed her. Even then, he probably would have just left the scene - he never shot anybody in the restaurant so what would make you think he would shoot somebody after the fact that would pose absolutely no threat?
The wife thing just came off as an excuse because he wanted to kill someone and be a hero.
What I visualize is realizing everyone in the store is safe, and the robber is leaving. If you still had my phone I would call my wife. If not, see if I could use someone else's or the stores' if it wasn't in use. Either way, I would feel my wife would be safe.