Uncle Tom analysis time:
Right off the bat, I hear "PUT THE KNIFE DOWN!" 3x. Suspect refuses to comply, gets closer to said officers, officers respond with justified force.
This time there are witnesses around the incident, but immediately start berating the cops for being concerned of their safety.
Upper city Philadelphia reports at least a murder or stabbing a day, yet THIS is enough for these idiots to start freaking out? (Point of reference: I watch local news, almost every day when I wake up, I see a murder, shooting or stabbing reported in Philly. I'm actually desensitized to it, that's how sad it is.)
Philadelphia isn't exactly the safest city in PA. I imagine this won't make it better. Brace for impact.