I am kind of a skeptic but their eyes were covered up by the shedding that's why they're missing their strikes and the dude zeroing on the shedded snakes due to him constantly checking their eyes as snakes are blind when they shed?
That's crazy. So cool how he communicates with them and they understand. Also, around the 1:20 mark when they all lined up staring like, "This guy is a force to be reckoned with!"