The riddle solver, who can't solve riddles

„Do you know who the culprit is?" A young boy, most likely in the age of 16, asked. The listener, a young girl, stayed silent and watched every little movement he did.

He stared at her for a moment then resumed to walk around the spacious room, like he always did when he was thinking. He began to retell the day of what he saw and thought about the murders.

"The first person, who was killed, was poisoned. He drank from a glass, which was on the table. Then he fell on the ground and died" He pointed with his left hand at the spot, where the man had dropped dead. The girl in the black dress stared at his lost right arm.

When the visitors arrived at the mansion, he already had no right arm. The boy continued his retelling.

"The other ten people died through drowning. All of them drowned in the same place and most possibly at the same time" He gracefully whirled around to the catiously-staring girl and laughed.

"If you know anything, then don't hesitate to tell me. I need hints and evidence to solve this puzzle" He exclaimed and once again turned his back to the girl. His tied blonde hair swayed with the night breeze. The girl's blond hair, but in a brighter shade than of the boy's, swayed in time with his hair.

Apparently unseen by the boy, the girl had hidden a silver knife behind her back and now pointed the tool at his unguarded back. She waited a few seconds to make sure that he stayed like that.

With quiet and also rushed steps, she swung the knife at him.

A sudden slap at his wrist made her loosen the grip on the kitchen knife, which fell on the ground.

The surprised girl grabbed the boy's jacket sleeve to prevent her from falling forward on the marble tiles. She accidently ripped the jacked from him and backed away in shock.

"Well, well, you had me taken off guard for a second there" The boy laughed at the girl's face. He continued, as if nothing had happened just a few seconds ago. "I've come to a conclusion, what about you miss? Do you know who the killer is?"

Her gaze lingered on his supposed to be missing right arm. The blond boy wore under the jacket a white shirt, but the right sleeve had large spots of red everywhere. Sudden movements tore her gaze from the arm.

"Miss, do you still not know the culprit behind all this? Then let me give you a hint. That person is in this room!" He spread his arm to his side, emphasizing the word 'room'. The blond boy smiled at the girl, who was still rooted on the same spot. His smile faded.

"Little missy, you should run now, if you value your life. The murderer Is in this room after all" The girl didn't move, she didn't even blink. He stayed silent for some seconds before his frown turned into a sinister smile. He stepped closed and closed, stopping a few feet away from her.

"It seems you couldn't solve the puzzle after all. Then I'll ask you one last time" The girl stared at him, no words came out from her mouth.

"Who is the killer?"