This episode is directed by Peter DeLuise who was a regular director in Stargate SG1 and Stargate Atlantis in which Amanda Tapping starred.
Acetylcholinesterase is not an enzyme inhibitor. Acetylcholine is a neurotransmitter, it carries nerve signals from one neuron across the synapse to the next. Acetylcholinesterase breaks down acetylcholine after it has done its job.
Magnus says she had done surgery in the trenches at Verdun. World War I in 1916 in northeastern France, the Battle of Verdun lasted over 300 days and there were almost a million casualties. WWI trench warfare was infamous for its squalor and lack of proper supplies.
Three actors in this episode were also in Stargate SG1: Peter Fleming, who played Malcolm Barrett, Gary Jones, who played Sgt. Walter Harriman, and Robin Mossley, who played Malakai in "Window of Opportunity."
A man has a grazing bullet wound on his upper arm and Magnus applies a tourniquet above the wound. Tourniquets are not a first choice in these cases because cutting off blood to everything below the tourniquet can kill a lot of the arm's tissue. A thick compression bandage directly on the wound will almost always control bleeding without risk to the rest of the arm.