Tsukuyomi

"I only wanted him to stop bothering me. Maybe he'd awaken the Sharingan because of it. Whether it turns out to be a blessing or a curse, I've already shown him enough mercy." Neji Hyuga was not joking around or mocking a child. If Uchiha Bingwei could break free from the fear Neji Hyuga had instilled in him, his Yin Release power would at least greatly increase. Awakening a one-tomoe Sharingan would not be much of a problem either.