How is "lull" different to LOL?

by Ju
(London)

Stephen was naked in the lounge.
On the sofa.
Eating his toast.
Dave came home from work early.
"Oh.
Hi Stephen."
"Hi Dave. I-
I was just checking the upholstery.
Didn't think you'd be back from prison so soon.
What's it been,
10 years?"

This is not what he would have classed as a LOL.