why did you mention Proatheris as a bad bite?
Hey BV. Maybe your friend has a high tolerance to their venom or was really lucky. I've heard that they often spend all their venom within a couple of seconds of because they are so psycho, and repeatedly strike and envenomate everything before they can be handled. So that could be why his symptoms were minor
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Resent research suggests that their venom is a lot more dangerous than previously thought. A full out envenomation can cause rapid onset of extreme pain, necrosis (tissue death) and ecchymosis (purple discoloration due to blood entering the subcutaneous tissue from ruptured blood vessels) and blebs (blisters filled with serous fluid). Excessive hemolysis (The destruction or dissolution of red blood cells, with subsequent release of hemoglobin) and thrombocytopenia (abnormal decrease in the number of platelets in circulatory blood) can occur within a couple of days. Liver and kidney failure follow due to the hemolysis and possibly disseminated intravascular coagulation (process in the body where the blood starts to coagulate throughout the whole body). In some cases jaundice (yellowish discoloration of the whites of the eyes, skin, and mucous membranes caused by deposition of bile salts in these tissues) can occur and death can result from the renal failure.
I think what freaks me out the most is the renal failure, doesn't sound to good. Plus there is no AV so you'd have to just fight it out.
Check out Adam Marfisi's envenomation account at
http://www.kingsnake.com/atheris/venom.html
Just glad it wasn't me.