Gotta work out the holes that enable this.
There are times when you look back at the outline and realized you papered over something. Yes, obviously if they are to move something has to happen to inspire the (lethargic) adults to move, and an injury to our hero (or another kid) is the most dramatic.
But since they are there as a protection, and I don't want to undermine how that works, I do have work out the boundary conditions that allowed it. (At least their motive for attacking them gives me half a reason.)