There was a struggle, and she used the revolver skilfully enough to wound the assassin in the hand--which explains the impression on the wall and on the door of the large, blood-stained hand of the man who was searching for a means of exit from the chamber.

But she didn't fire soon enough to avoid the terrible blow on the right temple." "Then the wound on the temple was not done with the revolver ?" "The paper doesn't say it was, and I don't think it was; because logically it appears to me that the revolver was used by Mademoiselle Stangerson against the assassin.

Now, what weapon did the murderer use?
The blow on the temple seems to show that the murderer wished to stun Mademoiselle Stangerson,--after he had unsuccessfully tried to strangle her.

He must have known that the attic was inhabited by Daddy Jacques, and that was one of the reasons, I think, why he must have used a quiet weapon,--a life-preserver, or a hammer." "All that doesn't explain how the murderer got out of The Yellow Room," I observed.
"Evidently," replied Rouletabille, rising, "and that is what has to be explained.

I am going to the Chateau du Glandier, and have come to see whether you will go with me." "I?
--" "Yes, my boy.