Trained with the Kinkou since she was younger, Shen was one of her idols. She trained with him, Akali and Kennen as much as possible. This was all before learning about Zed, her allies wouldn't talk much about him so she went to do research of her own. She discovered Zed's abilities and saw his strength. She believed his strength was far greater than Shen's and her entire life ideals shattered. She went in search of Zed in hopes to become his apprentice. He distrusted her the moment he set his eyes on her. To prove herself he commanded her to bring proof of her betrayal of the Kinkou. She knew she wasn't strong enough to take all three of her former friends in an equal battle. So she came up with a plan to ambush each of them , defeat them quickly and take a trophy of her victories.
First she targeted Kennen, she invited him out to train. Since she was still learning their ways and fighting styles, she asked Kennen to show her some abilities using the training dummy. She watched him intently, noting every movement, every ability, and measuring how much energy he has spent. Then she thanked Kennen and proceeded to leave. Unexpecting Kennen, tired from training and showing her fighting techniques. She stalked him as he traveled to his sleeping quarters. That's when she decided to strike, attacking the already worn out Kennen. Using her sai she quickly jabbed the small yordle's pressure points causing him to fall unconscious. She held her kunai to his neck but she couldn't bring herself to kill her friend, so she instead made an incision in his arm. The cut was just deep enough for it to bleed, she cut off a tuff of his bloody fur and stole his mask before bandaging his cut and carrying him to his quarters.
Next she went after Akali during the evening of the same day. Akali was getting ready to go to sleep in her room. Akali seemed pretty tired as she yawned and changed from her normal attire. Although what was about to do was a cheap tactic, she needed to prove herself. So she effortlessly slipped into Akali's room as she was changing, using her target's vulnerable and private state against her. She jabbed Akali with her sai and her target slumped onto the floor unable to move. Using Akali's kama against her, Yugami made an incision in her back, just enough to stain the weapons. She then dressed her temporarily paralyzed friend's wounds before leaving.
Just one more to go, she had to go after her idol, Shen. This would be the most difficult out of the three for he was the most experienced with ambushes. Shen was in the bathhouse, soothing his sore muscles. It looked like he was gonna be here for awhile but she couldn't attack him with so many people around. So she decided to cut the power and attempt to catch Shen off guard. From above she silently crept down and aimed her sai towards Shen , but unlike the others he was able to sense her and he dodged her attack. Shen knocked her back into the wall, she threw her kunai at him but he easily deflects them. She focuses on the practices she read about the Order of the Shadow, she was able to create a shadow of herself where her kunai landed. The shadow threw the kunai back at her. It grazed Shen's shoulder causing him to loosen his grip on her. She caught the kunai and threw them back at Shen, grazing him again. He caught on quickly and slammed Yugami into the ground. Her vision grew blurry but she thought she saw Zed behind Shen. She pointed behind Shen and he looked behind him barely dodging Zed's attack. Zed picked Yugami's nearly unconscious body and left. "This is my student now" Zed said with no emotion in his voice.