Whose Limb? A Night of Horror in Room 412

In Room 412, there were four male students living together. One day, the dormitory leader, Xiao A, didn't return all night.

The next day, Xiao A still didn't show up.

On the third day, fourth day, fifth day...

Xiao B: "Brother A is missing."

On the sixth day, a turning point occurred. Xiao C received a wet package at the doorstep of the dormitory.

With the other two roommates looking on, Xiao C opened the package, revealing a bloody arm bent into the shape of a chicken wing in front of everyone.

Xiao B couldn't help but vomit, and Xiao D stared fixedly at the wrist of the arm, as if he had discovered something: "This is Brother A's right arm, look, the wristband!"

Xiao A loved basketball and had specially customized a wristband with a unique-shaped letter "A" on it. The three looked at each other in shock, unable to speak.

On the seventh day, Xiao C received another package. This time, it contained a left arm shaped like a chicken wing, and the scars on it proved that it belonged to Xiao A, from when he and his roommates had a basketball accident.

Xiao D: "Who sent these two packages in the first place?"

"I don't know," Xiao C shook his head, "There is no sender's name or address on them."

The eighth day, ninth day, tenth day...

Every day in Room 412, they would receive a package containing Xiao A's left leg, right leg, and a shriveled torso.

"I suppose we'll receive Brother A's head tomorrow," Xiao B's lips trembled involuntarily.

The next day, the three of them collectively took sick leave, hiding in the dormitory waiting for the package to arrive. However, they waited all day and it didn't come.

At midnight, the three of them were exhausted and prepared to sleep.

Suddenly, there was a knock on the door.

Trembling, Xiao C opened the door to find a man who looked like a delivery person standing in front of him, holding a wet package. The corridor was dark, and the lights in the dormitory were out, making it difficult to see the man's face in the darkness.

Xiao B took out a flashlight and shone it directly at him.

As they looked at his face, the three were stunned: the person in front of them was Xiao A.

Xiao A, expressionless, mechanically handed the package to Xiao C and said, "You hold onto it, I need to go see someone..." With that, he turned and walked away.

"If the person with all four limbs intact just now was Brother A," Xiao B's eyes widened, "then whose limbs are in the package, and whose head will be in the next one?"

The three stared at the package, none daring to open it.

Now it's your turn - would you dare to open the package?