Here’s the sitch.
But you can’t actually see the bus driver run the red in this video:
Is there an all-red phase in the signal timing of this intersection? I assume so, but I don’t know.
The yellow line shown is about 200 feet long. It’s possible that a MUNI bus could enter the intersection on a yellow and then take six or seven seconds to clear it.
Cars going the other way need to wait for traffic legally in the intersection to clear, under CA law, so even though you have a green light that doesn’t mean you necessarily have the right of way.
Car drivers, particularly those with a running start, need to be mindful of this.