Movement in the Bathroom

The investigators are all in the living room focused on communicating through the Ghost Box. The rest of the house is empty. A voice recorder and IR video camera were in the bathroom in an attempt to capture evidence of the reports of the faucet being turned on and off by itself.

You can clearly hear the investigators talking in another room, down the hall. Yet, listen closely and you can hear what sounds like a sliding noise in the bathroom close to the microphone on the voice recorder.