I try to be a Good Citizen™ and do my Civic Duty™, so I parked on the other side of the street, and called 911 from a nearby bank to make sure it had been reported, and waited around for the police to show up so I could give an official witness statement.
Apparently, both drivers claimed they had a green light. I could see that the light was red in my direction, but that doesn't indicate one way or the other. I don't even think anybody was lying -- I think that they probably both honestly believed they had the right of way. I'm sure one of them wasn't paying attention and only thought they had the green, but it really makes you think about the unreliability of perception. Just thirty seconds afterwards, I was berating myself for not paying closer attention, because I realized that by that point I only had two or three points of observation that I was sure about, and all the rest had already evaporated from short-term memory.
The police officers thanked me for sticking around, and called it a classic "he said, she said" situation.
I say that the motorcycle cop was serious eye-candy.