He overdid it.

I was keenly on my guard against him.
"'I was foolish enough to go into the empty wing,' I answered.
'But it is so lonely and eerie in this dim light that I was frightened and ran out again.

Oh, it is so dreadfully still in there!' "'Only that ?' said he, looking at me keenly.
"'Why, what did you think ?' I asked.
"'Why do you think that I lock this door ?' "'I am sure that I do not know.' "'It is to keep people out who have no business there.

Do you see ?' He was still smiling in the most amiable manner.
"'I am sure if I had known--' "'Well, then, you know now.

And if you ever put your foot over that threshold again'-- here in an instant the smile hardened into a grin of rage, and he glared down at me with the face of a demon--'I'll throw you to the mastiff.' "I was so terrified that I do not know what I did.