A snake doesn't chew its prey. It just swallows them dead or even alive, they remain in the snake's belly for days and get digested.
This snakes ate so many hens, so much that there was no parts of any hen was visible in the room, still, the snake's belly was as earlier as when he had not eaten anything.
As the snake swallows the entire prey whole, so much blood on all the walls of the room has no explanation.
With so much weight of the prey in the belly, a snake cannot even move. After eating a prey, a snake goes in to a sort of hibernation. while the prey digests in its belly, but this snake remained as active as earlier.