In the movie Panic Room, how did the police know to come back? The police arrive at the house the first time as a result of Stephen Altman calling them. Meg Altman convinces them that there is nothing wrong and they leave.
However, they return within minutes/seconds of Burnham smashing the back window in an attempt to escape. Not just one/two patrol men either, but a full crew in tactical gear.
I know there were some pistol shots, but the gun was silenced so I don't think this should account for them coming back.
Was there something in Meg's conversation with Officer Keeney that let him know something was up, or was it something else?