What does Katie recall about seeing Laurie Pye outside their home one night?

One night, as Matt and Katie are doing the dishes, Luke puts Bo to bed. Matt notices Laurie Pye watching them outside the house. Laurie, Calvin Pye's only son, runs away when Matt goes to the door and calls out to him. They think nothing of the event at that time, but in hindsight, Katie wonders if Laurie was trying to ask for help and if they should have taken the episode more seriously.