This is set in the Arkham universe but in no particular game, although I may use some of the plot points from them!
Enjoy!

"Flash! Get out of there!"

"No, I'm almost there!" Wally yelled over the electronic tension that seemed to fill the entire room, making a buzzing noise that was almost impossible to talk over it. It seemed like a miracle that their communicators were still working in these kinds of conditions.

"It's too late. We need to evacuate everyone!"

But Wally pushed on, even when another electrical wave washed over everything in a radial manner from the generator he was meant to get at. The wave had pushed him back a few meters and no matter how much he tried to speed towards it, it just kept pushing him back. It almost felt like whenever he used his powers that the electricity in the air reacted in a similar manner to two magnets repelling each other. And even when he didn't use his powers it seemed impossible. His legs felt weighted down, his ears tingled underneath his cowl and made his nose itch. It was like wading through water. Acidic water.

Only a few more steps! If he could just get to the energy source in the middle of it, disrupt it, then they wouldn't have to accept that an entire populated area of Metropolis was going to…whatever this thing was supposed to do. Wally hadn't been able to make sense of what the scientist who built it had babbled on about and the situation had been too dire to ask for an in-depth explanation.

"Y.. nee…..get …..ere now….. entire buil…...ing unstab..!"

"I'll….. him and-"

He ignored the others over the com-unit, the electricity around him vibrating in his brain as he took another step closer.

There.

Just one more step. He could do this. He wouldn't admit defeat when he was so close!

He more or less shuffled sideways, closer to the generator and held his hand out. The next step was easy. He just had to disrupt the energy flow.

His fingers tingled and then burned the closer he got to the core. A keyboard with a glass pane above it keeping him from reaching inside.

Another pulse washed over him, his vision blurring out for a moment. Colors bloomed and mixed together as a headache made itself known right behind his eyes, only for the colors to fluctuate back into grey.

"I'm there!" He breathed out, not sure if the others could even hear him. "I made it, just one more second!" Wally yelled over the buzzing noise, over his growing headache and placed his hand against the glass pane.

It was warm and humming. His hand burned from the raw energy behind it. "I'm doing it on three," he said more to himself than to anyone else.

And then he vibrated his hand through, shattering the glass in the process. A few shards flew by his face, one of them cutting his cheek but he didn't even feel it.

Instead he focused on his hand, vibrating it faster and faster to match the frequency of the energy inside the core to nullify it, an ominous hum appearing in the back of his head. He wondered if some glass had hit his head or if the headache was about to split him open.

Several cracks echoed around him: The wall behind the machine cracking in two just as the ceiling behind him fell apart. The sound of someone landing heavily on the ground.

He could hear them shout his name.

But all Wally could see was his hand within the floating particles, almost like bubbles dancing against his skin. For the fraction of a second he thought he could see the yellow of his suit, the orange lines of the particles as they touched him and he wondered if he was about to die. If that was the reason why he suddenly could see the yellow and orange core of the machine in full color.

He marveled at it, ignoring the burning pain of the heat and energy. His eyes were transfixed on his own fingers, gently pushing the particles around.

Until it all snapped back to black and white, to various shapes of grey. The core imploded in front of him, bathing him in even tinier particles, the heat licking at his skin as he thought that he was drowning in it. His legs gave out beneath him and his skin felt stretched too far, too wide. As if something was pulling on him.

Wally wondered when his knees would finally touch the ground but he just kept falling forward and forward and before he knew it the world went black.

He watched Batman's' back disappear out of the canteen and with him the muted color around him.

"You're doing it again," Supes murmured into his meal.

"Doing what?" Wally replied just as quiet as he stuffed his face with a few frites so slowly it would do nothing for his body. Or distract him from the fact that the world around him was once again a range between black and white. Gone was the greyish red of his suit, or the almost not there blue of Supes costume.

Supes gave him an apologetic look before shaking his head. "Pining after him. I thought you guys talked it out."

At least they were far away enough from other tables for this topic. Unless Wally counted those who had enhanced hearing. He'd just have to hope they'd be polite enough to ignore them. He sighed.

"We did. It's fine." It wasn't. There was clearly something wrong with him and no one was willing to look into it. Not after Batman had given his final word on it that some things cannot be explained.

But Supes shook his head. "It's not though. And I get it, it's probably not easy to talk about it but...you can't just stare him down with those puppy eyes of yours."

"W-well I'm not actively choosing to do that." Now that was embarrassing. "It just happens." He mumbled the last part, his cheeks slightly warmer than before.

"I'm not trying to scold you," Supes said with an apologetic expression. "It's just not going to end well this way. I just want to…"

"I know…" He did know. Supes only meant well, always would and always will. And Wally was grateful for a friend like him. It just didn't make it any easier to stop.

Supes sighed and stood up, picking his tray up in the process. He stopped beside Wally and put a hand on his shoulder. "You know I'll listen if you want to talk, right? And who knows? Maybe you just need to moon over him for a bit to get over this." Clark's smile was genuine as he patted Wally's shoulder and left him alone at the table.

These days it felt like everyone left him alone.

Consciousness returned slowly to Wally. His thoughts felt muddy and the awareness of his body far away. He thought he felt something cool against his back, even as his skin felt too hot and tight. There were voices around him but he couldn't really make sense of them through the ringing in his ears.

"Do you s'pose it's the birdie?"

"Are you dumb? The Bird doesn't wear yellow. And there's no cape either. It ain't the Bird."

"So it's 'nother freak? Gotham has 'nough of' em."

A foot was placed against Wally's side, trying to turn him over but all they did was lightly kick him, causing him to groan.

"We could unmask him. Bring him to one of 'em bosses of yours. Might be worth something."

"Can't be worth anything if no one knows the guy."

"You havin' a better idea then?"

"Anything better than standing in this rain."

"What's it to you huh? Fine. If you don't wanna then I'll do it myself."

Wally felt hands turn him over by the shoulders. He tried to open his eyes but his vision was blurry, blotches of black and murky grey blending together.

He felt fingers patting him up and down before finally pulling on his cowl. Yet he didn't have the energy to do more than slur a "please, don't".

"Watch out!" The voice farther away called out just as the fingers underneath his cowl vanished, his vision briefly turning black without having closed his eyes. There was a strange sound, like a heavy cloth being quickly moved around as well as skin being hit with shouts of pain.

Then it was quiet again.

The rain kept hitting Wally's face, so he had closed his eyes again when he felt someone touching his shoulder. Different from the guy before.

Wary, Wally forced his eyes open again, trying to blink the blurriness away. It slightly worked since he could make out two large, pointy ears above him.

"B'man? Wha' happ'nd?" For a moment he did wonder what exactly had happened before the thought flew away as soon as his body was moved. The hand on his shoulder vanished as Batman tried to help him get up. Numerous aches in his body flared into existence and he almost dropped back onto the ground, if it hadn't been for Batman catching him.

After that he felt a strong arm around his middle while his head was resting against something cool, hard and wet as his entire world seemed to tilt again. His stomach dropped and his head spun.

The thought that this must be how people felt when he carried them around briefly came to his mind before it flitted away again and he passed out again.