Seeing in the Dark

Scott wanted to have a fight before bedtime. He wanted to turn off all the lights first. I complained that it would be too dark for me to see. He offered to teach me how to see in the dark--
S: I already taught Hayden how to see in the dark.
D: You did? How do you do it?
S: First you find the shadows, and then you check to see if there are any monsters there. And that's how it works.
D: Really? Okay. Let's try it.