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Dr. Helm is hard at work at his office on what seems to be a decoction or infusion--the aforementioned medicine, anyway, and one of Montoya's minions barges in saying the Colonel wants Helm to go to him. Now.
When Helm says he's busy, the guard pulls a gun.

Does he want me alive or in a casket, Helm says, cooly.

Quick like a cat, the doctor blocks the man's thumb, twists the gun from his hand and plops it in a pot of water. If you liked what I did with your gun, you'll be ecstatic over where I plan to put that saber.

The soldier leaves.

Afternoon passes to sundown... ...and then to evening. Montoya is burning up with fever.
Grisham, where's the doctor. Why isn't he here?
Grisham sees Helm out the window and tells Montoya. Enriquez sneaks up behind Helm, knocks him out, steals the medicine, and runs away.

Grisham fires and misses.

Montoya whines, "He killed my doctor!"

Grisham thinks a moment and then starts howling that the Queen of Swords has stolen the medicine.

Fever...page three