Responses

well the rope on his hands is connected with the rope on his feet which is being lifted up by the rope connected at the water host so his hands is also being pulled down at his back, so when he try to get up, his hands is stopping him
for you to understand more since explaining it with words is really difficult , try putting your both hands on your back while lying down then put your feet up and try lifting yourself up, and it's really hard
Eh, why wasn't this guy just floating on water? The way he was tied up didn't stop it. ( ̄∇ ̄")