Sins of the parents upon the children

In a split second, he released his grip from Danil's neck and quickly grasped Viktor's neck, his grip growing dangerously firm as his eyes flashed with seething rage.

"Are you aware of what you have done?" Dark wisps shot out of his body as he thundered. "I assigned you one task, but you decided to ruin it."

Viktor gagged up, trying to grab Nikolai's hands, his eyes turned into their yellow wolf-like form.

"Nikolai!" With disbelief in his voice, Danil called. He remained motionless, rubbing his neck and glaring at Nikolai, who was furiously strangling his brother. "What blood pearl?"

"The blood pearl won't be brought back by killing Viktor." Sasha cooed, taking slow, graceful strides into the training ground. Her eyes were a wolf-like shade of green. 

"Fun destroyer." Nikolai tsked, released Viktor and took a few deep breaths to settle himself before giving Sasha a friendly glance and a smile.