I think the chase boat was keeping Prada from running over the sail, which would not have been good for Prada. When you sail around a capsized boat or a boat stuck on the mark do you protest them for being in the way?
Good point...but they're not throwing stuff in the water that I have to dodge as we proceed up the course. Consider if LR had been closer and they couldn't avoid hitting the jib and got fouled up in it. What then?