Helen, you must confine yourself to your room tonight. Watson and I will stay in the hotel across the street. Put your lamp in the window to signal to us. Watson and I will stay in your room tonight to see what is really going on.
What are you talking about sir?
There! You see it Watson!
The band! The speckled band!
You see Watson, Dr. Roylott would put the snake though the ventilator, have it bite the victim and the use the leash to put the snake back into the safe.
When I hit the snake with my cane, that caused it to go back through the ventilator and land directly on top of Dr. Roylott causing the snake to bite him. Therefore I am indirectly responsible for Dr. Roylott's death.