On a cold and chilling night, the lone inhabitant Senmura was suffocated by gas in his own home. Around midnight, the building manager, smelling a gas leak, went to his house and, upon opening the door, discovered Senmura's body. In the kitchen, the gas valve was connected to a long tube, and gas was leaking out in large quantities, but for some unknown reason, there was a puddle of water on the kitchen floor. After an autopsy, it was determined that the cause of death was carbon monoxide poisoning, and the deceased had also ingested a small amount of sleeping pills. The time of death was approximately 10 PM. In this small room, if the doors and windows were closed and the gas turned on, death would occur within 20 minutes. The perpetrator most likely turned on the gas at 9:40 and then escaped. Two days later, the police arrested a suspect who had been detained for the whole night that day because of drunken behavior. If this suspect had turned on the gas and then escaped at 8 PM, the victim should have died around 8:20 PM. However, the victim did indeed die around 10 PM. So what method did the suspect use to delay the gas by about one hour and forty minutes?
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