With his yami now leading them, the four knights swam quickly through Ryou Bakura's bloodstream. They weren't too sure where he was leading them, but they kept their swords ready anyhow, knowing that spores could break through at any time.
"I hope you know where you're going." Kaiba muttered, now bringing up the rear. It was obviously a position he wasn't used to taking.
"I told you already. I know this body like the back of my hand." He shouted, turning around only briefly to snarl at the CEO.
As they floated closer, they could see their destination. It was Ryou's heart, covered in thousands, perhaps even millions, of spores. The valve ahead of them opened and closed erratically, mimicking the actions of the heart itself. They could feel the rapid heartbeat rattle their armor. It felt so fast, that they feared it might literally explode.
"This doesn't look good." Malik gulped. Everyone else nodded an assent.
"We don't have much time to waste." Yami Bakura shouted, pointing his sword at the main valve. Before its light could even discharge, an attack wave of at least five hundred spores flew straight at them. They dodged out of the way just in time.
"You're not kidding." Yami Yugi added, slicing them as they flew by again.
"Let's blow these spores back to the shadow realm!" Malik shouted, tapping his sword with Kaiba's. The blast freed up the area around the valve, but more spores quickly took their place.
The three blasted together, but it still was not enough.
"There must be a more efficient attack…" Kaiba growled, but he couldn't think of one.
"Get moving!" Yami Bakura interrupted his thoughts.
"What are you talking about?"
"I said get moving!" he shouted again, repeating himself. "Make your biggest blast and run for it! I'll cover you!"
The other three glanced at each other, and then back at Yami Bakura.
"All right." Yami Yugi nodded, holding his sword out. "This one is for Ryou! Guys, channel all your heart into your swords!"
"Right." Malik added his sword to the attack, as did Kaiba. They could felt the swords vibrating along with their intentions.
The resulting blast disintegrated thousands of spores on contact. They held their position for a moment, before the spirit of the millennium ring started yelling at them to run.
The knights leapt through the valve into the closest ventricle, followed quickly by Yami Bakura, slashing as he threw himself backwards through the opening.
"They're still coming…" he gasped, rolling back to his feet despite the ground bumping unsteadily underneath him. "I'd suggest we keep moving!"
The other three nodded, each heartbeat sending them flying up and down.
"Where are we going, anyway?" Malik asked, slashing at the slew of incoming spores.
"To the place where this whole mess started! Where else?"
"And just where would that be?" he asked again. He looked ahead. The valve to the right ventricle was open.
"He was first diagnosed with pneumonia a couple weeks ago." Yami Yugi stated rather calmly.
"The lungs." Kaiba answered, glancing to Yami Bakura.
"You got it."
He took a giant step forward, and then stopped. They all paused.
The ground beneath them had stopped moving.
And that meant Ryou's heart had stopped beating…