Wow, those are some large snakes - all of them. I know a guy that spent three days in the hospital and almost lost his foot from being dumb enough to try to chase a pygmy rattler off a trail with his toe. Unfortunately his toe was clad in a running shoe. Lil pygmy had enough tooth for that, and he was maybe a foot long.
I get the creeps everytime I need to go into the crawlspace below the house. At least those monsters would be big enough I might see them before they become annoyed.