"Weiss!"

Jaune rushed to her side, the look of shock in her face was visible as she tried to register the fact that a spear had impaled her. Hands shivering, she gave one desperate look to Jaune as she fell down. The spear that was conjured by Cinder dissipated out of thin air making it much worse as there was nothing applying pressure on the open wound. Crimson started to spread on the heiress' clothes. All the while Jaune pushed both of his palms down on the wound.

"Weiss, stay with me!"

Her cool blue eyes hovered over Jaune's panicked form. Her vision swam as she started to see him turn from one to three, she could feel the something warm on under her, two more figures joined to help her; one with raven black hair with a stripe of pink and another with ginger though for her fleeting life could not see their faces.

Tears welled up in the blonde's eyes as he kept repeating the words 'not again' over and over. Across the room Cinder and her group had gathered. "A valiant effort, but it's pointless. Hopefully this will serve as a lesson,"

"I won't use you," Jaune said quietly though it might as well have been a shout due to the entire auditorium being empty.

Everyone looked at the teen in question, unknown to them blue eyes switched from red to blue repeatedly, "She'll end up like me!" he shouted.

Cinder raised an eyebrow at the sudden raise in volume just out of curiosity.

"Must've broken him," Mercury said while giving a shrug.

"Well, that's good then," Emerald said.

Meanwhile Jaune was having a conversation with someone else, a someone that that was older than the four kingdoms themselves. Yang grabbed his shoulder and gave a look of concern on his face. He muttered quietly something while ending with 'promise'. He brought up one of his hands; his palm was coated with Weiss' blood a grim thought but for some reason he couldn't find the energy to care. He brought up one finger and without any warning, jammed it in the open wound.

He ignored the sounds of gasps that escaped their mouths, he also ignored the fact that Yang was pulling him away from the heiress yet for some unexplained reason he wouldn't budge despite her being stronger than him. This slightly piqued Cinder's interests after all someone who's as strong a Yang should've been able to move Jaune but for some reason she couldn't.

"Jaune, what are you doing?!"

"I'm, fixing her," Jaune said while glaring at the other blonde. The sudden snap shocked Yang enough that she let him go.

To everyone's shock large veins popped out of the arm that had its finger lodged in Weiss wound, something bright crimson swam through the veins and towards the open wound, while this was happening the everyone who wasn't unconscious watched the entire debacle with rapt attention, the veins began to go back to normal and Jaune's finger left the wound. Everyone watched with wide eyes as the hole on Weiss' stomach closed up almost instantly, they could even see her glowing slightly, a sign that her aura had recovered. A groan escaped the heiress' mouth and everyone gave a huge sigh of relief.

"Weiss, how are you feeling?" Yang asked.

"I-I feel energised, I feel like I can fight again," she said.

"Well isn't that fortunate!"

All of the Beacon's students snapped their head when they saw Emerald, Mercury and Vernal charge at them. Yang, Nora and Ren were about to intercept were it not for the sudden appearance of small black spikes. The former three jumped back – narrowly avoiding the larger spike that just erupted from the ground, it went back to the ground the smaller spiked also went back down underground one by one, everyone traced the prongs and to their shock it was none other than Jaune Arc.

Said man had pulled his fist out of the ground and stood up, he placed himself in between his friends and Cinder's group. Said woman narrowed her eyes, Jaune's eyes locked with hers. The look of anger clearly shown in his face but for some reason Cinder felt that there was more behind his eyes; it was like she could see millions of lives hidden behind those eyes. He brought his fists up watched Mercury, Vernal and Emerald surround him trying to find a way to deal with the new situation.

Vernal attacked first with Emerald in tow, to their mild surprise Jaune charged them as well, Jaune threw a punch with was easily dodged by Vernal but she wasn't prepared to the sudden foot on her stomach, air escaped out of her mouth as she was sent careening towards the statue that lead to one of the Relics. Despite this Emerald had managed to close their distance, using her semblance she multiplied herself into five, each of them raising their weapons. Jaune didn't even try to dodge the first nor the second Emerald; their weapons basically phased through them. He brought his fist up and went to punch the third, Emerald's eyes widened in shock.

Due to this, Jaune managed to sock her right in the jaw which brought her down on the floor. He approached her and grabbed her by the throat, he brought her up with relative ease, Emerald struggled to escape from his vice grip. Jaune squeezed his hand depriving the girl her oxygen. Let her weapons go in exchange of clawing his hands – trying to make him let go.

"Jaune, behind you!" Yang shouted.

Jaune didn't have time to look as his chest exploded outwards, coating Emerald in gore while a massive hole was seen where his heart should've been. Through this hole everyone could see Mercury's smoking boot. By now, Jaune had let go of Emerald just to look at the gaping hole in his chest.

"Wow, you didn't even have any aura, that su- "Mercury wasn't able to finish as Jaune's hand shot for his neck.

He was lifted up the ground much like the same with Emerald, with ease, eyes widened when crimson tendrils started to occupy the gaping hole, in an alarming rate the tendrils regenerated the heart followed by the lungs then the ribs then the muscles then skin and finally the shirt. Jaune looked at Mercury with a sadistic grin.

"That hurt," 'Jaune' said.

Mercury along with everyone's eyes widened in shock when Jaune was suddenly engulfed by the same crimson tendrils. When they disappeared, what came out was a totally new person. Blood red eyes looked up at his perpetrator with an almost predatory smile, the hood that covered his face somehow made it slightly scarier, he also wore a black, leather jacket that seem to pulsate slightly with red veins.

"You talk too much," the man said.

He slammed Mercury on the ground hard, with a raised fist he punched him hard enough that his aura shattered in an instant, another punch snapped his head to the left leaving wild splotches of blood on the floor. It finally ended when the man raised both fists and slammed it on his face, crushing his skull while also making a wide crater on the floor. Just when they this he was done black tendrils sprouted out from his back and towards the deceased teenager, Cinder narrowed his eyes now gaining him her full attention. The tendrils consumed Mercury and by the time they were gone what graced them was the same teenager that just had his skull crushed.

'Mercury' moved around and shook his body, "Been awhile since I've done that,"

"Interesting, may I know you name?" Cinder asked rather calmly as if someone had not just died.

"Why should I tell you?"

"The only people that I know that can control a Grimm is one," Cinder replied while she slowly revealed her Grimm arm.

The impersonator gave a dark chuckle, "I'm not a Grimm… I'm a virus," his chuckling suddenly stopped, "And you've just hurt my host,".

"Then shall I know your name Mister Virus?"

"Mercer. Alex Mercer," he said with a predatory grin while shifting his right arm into a large and terrifying blade.

A/N: Don't ask me why I wrote this, frankly if an idea pops in my head I just write it. Anyways let me know what you guys think about this story. Unfortunately, this would only be a oneshot. Maybe I could turn it into a series because I had this whole idea of Mercer infecting Grimm with his virus and creating this massive army that was just underground. For those who didn't understand how Alex managed to spot where the real Emerald allow to tell you the simplest answer: he used his thermal vision.

Anyways I hope you enjoyed this story and with that I bid you all adieu

Peace~