(The video Katz refers to is here.)
1. The Location
Silwan's isn't really the most tense place. Photographers waiting for stone-thowings would be more likely to go to places like Bilin or Hebron. You wouldn't hang around Silwan unless you knew ahead of time that something was going to happen.
Also, the only photographers who can safely work in Silwan are the ones who are already known to the locals. Newcomers wouldn't be allowed to operate, and would be in physical danger. I've seen it.
2. The Photographers' Positions
When photographers are getting ready for something, but they're not sure how it's going to play out, they tend to position themselves close together. Here, the photographers are more spread out at different sides of the action. It seems everyone wanted to get their own unique position."