There wouldnt be much anyone could do if a huge snake got someone in a fully commited coil. They bite, wrap, move you, and wrap more all in under 5 seconds. I watched a show measureing the squeeze force of a green anaconda, it was squeezing at 90lbs per sq. inch for a solid 15 minutes. They calculated that out to the equavalent of a bus sitting on your chest. Unless the weapon is already drawn and your ready, i doubt its gonna do any good. These snakes are ambush predators. They wait so you arent paying attention to them. Not that there out to get you but if they decide to, nobody would know it till it happened. Multiple people is the only way to help the situation or make sure the snake isnt present period.