Thank goodness for this off-duty cop in Brazil.
The officer remained completely calm, then pulled her own gun and put the criminal down in seconds.
Her incredibly calm demeanor belied the gravity of the situation, which she completely took control of, as you could imagine.
CCTV video caught the events as they unfolded.
WARNING: GRAPHIC CONTENT
Officer da Silva Sastre was picking her children up from the Colégio Ferreira Master school in Sao Paolo when the armed man broke into crowd brandishing the pistol.
In the video, you'll see her calmly stepping aside while pulling her firearm and then springing into action.
Márcio França, the Governor of São Paulo, said that Sastre "intervened against a young man who assaulted kids and their families with a gun."
The criminal was transported to a local hospital where he was pronounced dead.