WaPo:Tim Kaine's claim the Las Vegas shooter was only stopped because he lacked a silencer

[friendly_iconoclast]

3. Why would something as loud as a jackhammer not be heard in the hotel?

Again from the WaPo piece:

Officials credited hotel security and the police for quickly locating the source of the noise, based on officer observations about the trajectory of the shots and information from the guest calls inside the hotel. That led officials to conclude the shots were coming from a room between the 29th and 32nd floors. Paddock then gave himself away when he fired at a security guard checking rooms on the 32nd floor, apparently because Paddock had set up remote video cameras to monitor the hallway.