"Well the near one is easy," Pinkie shouted back down the slope to Lyra, stopping her work to look at the bridges. "It's going to land right on the nearest edge in the middle of the bridge. The other one though... it's going bounce off the top of the highest carriage in the river, hit the shield and break it, bounce directly upwards, then land on the bridge either breaking it or not breaking it. That's up to the bridge. I'm not exactly an expert at bridges, so I can't tell."