How we cite our quotes: All quotations are from The Shining.
Quote #4
HALLORANN: Well, look sir, I hate to put you to any trouble, but there's a family up there all by themselves with a young kid, and with this storm and everything.
Hallorann might seem like he's just concerned about Danny and his parents because of the storm. But the truth is that Danny has used his mental powers to warn Hallorann that something terrible is going on with his family.
Quote #5
WENDY: You son of a b****! You did this to him, didn't you?"
It doesn't take much to convince Wendy that Jack is responsible for the bruises around Danny's neck. After all, Jack has a history of hurting the kid. Plus the fear and isolation of their situation is putting everyone on edge to begin with, so it's no wonder why Wendy would look for the simplest possible explanation. The alternative is believing that a ghost strangled Danny.
Quote #6
JACK: I haven't laid a hand on him. Goddam it, I didn't. I wouldn't touch one hair of his goddam little head. I love the little son-of-a-b****.
Jack is sick and tired of having his previous mistakes held against him and he hates that Wendy would be so quick to blame him for their son's injuries. And to show how upset he is, he decides he's going to murder both of them. Or something like that.