Touchback?

[prosec34]

With the night off, I went to see my old high school play. Here's what happens: Punt returner sees ball is going to land around the 10, so he gets out of the way to let it roll. It rolls near the goal line, but doesn't stop until a player from K downs it at the 1 yardline after having slid into the endzone. The K player was completely in the endzone, laying down, with his arm outstretched the stop the ball from coming in.

I'm convinced this should be called a touchback, but the back judge marked it at the 1 and the crew didn't discuss it.

I'm not crazy, am I?