I can only imagine the conversation his friends must have had:
"Hey look Wang is passed out!"
"I know, lets spread his ass cheeks open and insert this live eel that I have lying around up his asshole!"
"I get to lube it!"
"Haruso, watch out the Eel is going further than we expected, try to catch it"
"Zang, I'm trying but the eel is too lubed up I can't seem to get a firm grip...I...Oh shit, I lost it, its all the way in"
"Haruso, Why is there blood coming out of Chang's asshole?"
"Quick lets leave before someone sees us!"