It turns out there was another hawk attack two days ago. And it happened to a SoSHer who conducts tours of the park. She posted about it in the members-only section:
[I] was yelling something to one of the tour guides ... when bam! I got whacked in the head.
At first I wasn't sure what it was, but I looked and saw the hawk flying away. I put my hand up to the back of my head and when I pulled it away - a pool of blood in my hand.
I kind of went into a little state of shock. Security wanted to call an ambulance, but I just wanted to get myself to the hospital. ... I have 3 large scratches and 2 puncture wounds in my head. ...
I feel super badly for the birds. ... Several of us who've seen these hawks before believe that they might be relatively young. We can remember them nesting in the lights for the last 3 years or so. This is the first year they've been as active in their mating ritual ... Who knows why they didn't pick one of the lights that were there all off season, but they didn't. Instead they picked this grating above the State Street Pavilion (and right below the press level). The sticks were blowing off and they kept bringing them back. Finally, on Monday, the female laid an egg next to what initially looked like a piece of carpet but turned out to be someone's winter hat. She must have rolled the egg onto that and was sitting on it while he would go off and find more twigs. ... And of course, they became more protective.