Hitch, there would be 2 local controllers on duty ( one for each pair of runways ) and a supervisor. The supervisor would be calling approach control to cancel ops to 07L. The two planes she sent on a missed were switched to tower before they got the message. After that the Supervisor will talk with emergency services to see what reserve equipment was available. If all emergency equipment was dispatched to the event they would prepare to terminate all operations. KLAS has multiple Emergency buildings. Normally only one is called. If the first on scene Boss thinks its needed, all are dispatched and all operations halted.