After closing the bathroom door, Zhang Heng did not turn on the faucet right away. Instead, he looked at Fan Meinan with worried eyes.
"We may be able to find other ways. You don't have to do this..."
"Yes, you are right, but your friend probably can't wait that long," Fan Meinan insisted. She took a deep breath and turned on the faucet of the bathtub faucet. "I will struggle, and I might try to catch a breath. You, however, have to make sure that my nose and mouth do not leave the water..."
Fan Meinan paused. "Set the time to 4 minutes. If it is too short, I may not be able to look for anything valuable. If it is too long..."
"If it is too long, you may suffer irreparable brain damage. Even if I manage to save you, you'll probably be a vegetable forever," Zhang Heng went on. "When a person is in a hypoxic state, it only takes five minutes before the brain cells start dying off. So, I have to resuscitate you within five minutes."