It was at some point during the practice matches when Rainbow Dash realized how much pain her wings were in. It had been a good two hours and a heavy throb like a broken tooth ached all the way along her humerous bone down to her primaries.
 
“You guys, timeout.” Rainbow Dash called and some of the activity lessened on the cloudisseum, though most continued without any pause while she floated to a platform, rubbing her left shoulder with a pained look. Above her April Showers caught the cloud ball and looked down at Dash.
 
“Want us to wait for you?” she asked. Rainbow Dash palmed her shoulder then shook her head. “Nah, it’s good, I’m just going to rest my shoulder for a little bit. Rainbow Dash went towards the benches and sat down with a heavy sigh. Only a moment later Dash felt the twinge of pain return, darting in and out of her sensory awareness like small yet intense pen needles. Just as she was about to head for the locker room to grab some muscle cream, Dumbbell landed in the stand next to her.
 
“Need some help with that?” he asked, referencing her shoulder. Dash shrugged. “Sure, you got something to rub on this?”
 
“Just these miracle workers.” Dash felt his fingers press into the tenderness of her trapezius muscle.
 
“Oooh…ung…mm!” She clamped a hand over her mouth, but the sensation was indescribable. The pain was just…leaving! Sliding away like hot oils down her neck, and out through the tips of her wings. “Where did you learn how to do this?” She breathed sharply and scowled when Dumbbell chuckled behind her.
 
“Just something I picked up from a masseuse who used to live up here a while ago, I think he lives in Ponyville now.”
 
“Ah, okay.” Rainbow Dash couldn’t allot enough brain cells to completing her sentence as Dumbbell’s applications cut through her shoulder and wing pain like soft butter.
 
“Looks like Shine did a real number on you. I don’t remember her playing this hard since flight school.”
 
In the cloudisseum, Rainbow Shine deflected a cloud ball with a gust of wind powerful enough that the twirling cloud mass shot back to the other side, and straight through the opposite goal post before anypony could stop it.
 
“She must have practiced a whole lot.” Dash mused. Dumbbell sat next to her when he finished her quick massage. A few minutes passed by as they watched the other players passing and maneuvering deftly through the air.
 
“Yeah, we can barely get her to lift a finger in the cloud factory but out here she works like a dog,” he said. “Damn near every day since the last time you two had a 1 v 1 in the flight school arena.” There was a pause, Rainbow felt her ear twitch in annoyance when an awkward beat of silence ran between them. Dumbbell continued. “Do you remember that day?”
 
Rainbow Dash’s ears fell and a phantom pain ghosted across her back. “I remember,” she tugged absent-mindedly at a feather. “You got me kicked out of school.”
 
“That was the day after.” Dumbbell corrected. “After you broke Rainbow Shine’s wing.”
 
Rainbow Dash’s back arched. “That was a long time ago, why bother bringing it up now?”
 
The stallion rolled his eyes. “I know you’re practically blind, deaf, and dense, but you can’t tell me that you haven’t picked up on the very un friendshippy way Shine’s been around you since you’ve been here,” He couldn’t help but smile. “She makes us look like the best of pals.”
 
In fact RainbowShine’s wing was broken once…but-
 
“What happened back then isn’t important. It’s in the past.” she growled.
 
“And I’m pretty sure Shine was trying to break my wings. What I did was in self defense.” When Dumbbell’s grim expression failed to change she added.
 
“She was trying to kill me.”
 
“Oh yeah?” Dumbbell smirked, his eyes narrowing. “Pretty sure four years ago I was the one trying to kill you.”
 
“As if you had a chance.” Rainbow Dash muttered. In the span of that exchange, the awkward mood soured into something deep and regrettable, something Rainbow Dash couldn’t sound the depths of. She averted her eyes not wanting to face Dumbbell’s accusing gaze, that and she wouldn’t admit that she could not face it.
 
“What’s bothering Shine is bothering me,” Dumbbell’s tone hardened. “It’s bothering all of us. But she won’t tell us the truth. So I figured I might as well get the truth out of you.”
 
“None of that was my fault.” she whispered. Behind her Dumbbell snorted.
 
“That’s not the way she tells it.”
 

 
Some more fanfiction. Basically a continuation of  
this image here. Something happened between Dumb-bell and Rainbow Dash that broke them apart, and it involves Rainbow Shine. Dash doesn’t want to talk about but if she’s going to be around these ponies for an extended period of time then it will have to be addressed eventually.