As the article says, she's currently not under arrest. However one never knows if that will change down the line. Since the article does not give a lot of detail, I make an assumption that she knew her son was in the stairwell, and the sound of the altercation prompted her to assume it was her son in danger. However if she did not, ie her son had just got home and she was unaware, I would have wonder about running out to meet the danger vs staying in and calling 911. I've seen that quite a few members are from the Philadelphia area, and wonder what y'all think, and any input on how the local LEAs typically treat situations like this.