So, in the opening the good Doctor mentioned that the robots would be patrolling the top 3 floors. Does this mean there were MORE? Could they have not just gone to the first floor? Also, the robots could BARELY get up the escalators. Maybe they could have just gone up or built stairs to effectively stump the bots? Lastly, if these were security robots shouldn't they have alerted the police? At the very least people could have heard the gun shots, explosions, cries of anguish from dying teenagers and at least CALLED the police? Weren't the janitors locked in as well? Couldn't they have done something?