 The eyes were on the crowd, but it wasn't on this building. And if it hadn't been for the locals, who were the only ones to take an action, if you see all the reports, it's the locals that are flagging him with a range finder. It's the locals taking photographs of him with the backpack acting suspicious. It's the locals chasing him up onto the rooftop, trying to smoke him out. The Secret Service didn't take any action themselves until it was too late. The Secret Service guy didn't save the president's life.