Cardin swung his mace at Ruby's head, she blocked it and kicked him in the stomach. Just before she fired a shot, he swiped her legs out from under her and she pulled the trigger, just as his mace made contact with Crescent Rose's barrel. This caused a rupture in the barrel and the weapon exploded, throwing shrapnel into Ruby's chest, but Cardin, who had armor on, was fine.
Goodwitch called off the match to see to Ruby's injuries and the rest of RWBY ran to her as well. Blood was pooling around the young girl's unconscious body.
It had been three months and Ruby was still in a coma after what Cardin did. But the school ruled it an accident and Cardin got off scotch-free. Yang was infuriated. Her sister was in a coma and the person responsible was innocent?!
After the incident, that doctors had put something into Ruby's chest to keep the shrapnel out of her heart. But Yang hadn't been able to see it. All she knew was that it required to be plugged into a car battery.
While Blake was visiting the young leader, her eyes flew open and she gasped. Ruby looked down and saw the bandages on her chest and the wires sticking out, and began to rip them off. She saw that there was a metal tube going into her chest and turned over to Blake. tugging on the car battery. "What the hell did they do to me?!" Ruby asked frantically.
"They put an electromagnet in your chest to keep the shrapnel out of your heart." Blake explained.
"What shrapnel?"
"The remains of your weapon."
"Wha?"
"Cardin demolished Crescent Rose."
After a bit of crying, Ruby asked, "How long was I out?"
"Three months." Yang said from the doorway.
"Three months?! I was out for-" Ruby stopped when the doctor walked in.
"Oh, MIss Rose! You're awake!" He said, turning around and walking away. When he came back he had a blue glowing circle. "Listen, I'm going to need your help on this one." He told the other two.
"I'll do it." Yang said.
The doctor pulled the original piece from Ruby's chest and put it to the side. "Now I just want you to reach in there and pull the wire out." He told Yang.
"Is it safe?" Yang asked.
"Yeah, it's fine. Just like Operation; don't let it touch the socket wall or it could beep."
"Okay."
"Just gently lift the wire."
Yang slowly put her hand in, but immediately "I don't think I'm qualified to do this."
"No, no. You're doing fine. You can do this."
"Okay, okay."
Yang slowly put her hand back in.
"Copper wire." He told her. "Copper wire."
"Okay, I got it."
"You got it, just don't let it touch the-"
A loud beep sound was heard, making Yang jump and Ruby scream in pain.
"It's when you're coming up, that's what I was trying to tell you before."
"Sorry."
"Now make sure, when you pull it out that you don't pull out the magnet."
As he finished his sentence, Yang pulled the magnet out and everything started beeping. "That's the end of it!" The doctor said. "And you just pulled it out." Yang went to put it back in, but he stopped her. "Don't put it back in!"
Ruby was breathing heavily as yang set the magnet down. "What's wrong?" Yang asked.
"Oh, nothing. I'm just going into cardiac arrest because you just pulled out what he told you not to pull out."
"I thought you said this was safe!" Yang yelled at the doctor.
"Just put this in." He told her, handing her the blue glowing circle from earlier. Yang put the wire down in there and the machines stopped beeping.