He could love the vegetation and be quite happy and unquestioned, by himself.
He had better send a note to Hermione: she might trouble about him, and he did not want the onus of this.

So at the station, he wrote saying: I will go on to town--I don't want to come back to Breadalby for the present.

But it is quite all right--I don't want you to mind having biffed me, in the least.

Tell the others it is just one of my moods.
You were quite right, to biff me--because I know you wanted to.

So there's the end of it.
In the train, however, he felt ill.