The video doesn’t start early enough to show her arrival. It’s possible that, since the light was red for cross traffic, hers was green. Perhaps she started into the intersection, then saw the oncoming emergency vehicle, and stopped to yield the right of way.
Regardless, it doesn’t (shouldn’t) excuse the cops. Like doctors, the rule should be not to make things worse. Slowing down to check the intersection when you’re entering on a red–even with lights and sirens–seems like standard procedure where I’m from.
