Natasha: BRUCE!
Bruce: ow Nat. Why do you have to shout at me? I'm right next to you! Do you wanna see the other guy?
Wanda: you fell asleep.
Bruce: wait what?
Steve: I wouldn't blame you.
Pietro: (walls over to them) hey! You ready for your race?
Wanda: please dont remind me.
Pietro: come on. It's just a bit of running.
Steve: unlike you, we can't drag our partner around.
Bruce: and unlike the two girls, we can't control the other's mind to make us both work in harmony.
Natasha: we're having a fair game. Don't believe us? (Brings out rather and holds it to both the boys necks) you better.
Mr Zapdos: Right. Last pair for today, Natasha and Wanda against Steve and Bruce!
Steve: good luck.
Pietro: See you soon sis.
Wanda: soon? Ok. (Winks at Natasha)
Mr Zapdos: Go!
From this point forwards, instead as a script I will do it as a story format
Both the teams start running "You ready for the plan? Asked Natasha. They were running in perfect time, way ahead of the boys who were stumbling all over. Wanda looked behind her and see both the boys and laughed. "Touch chance they will be catching up any time soon." Wanda joked and pointed to the boys behind. They turn around and see a huge crowd stumbling for Bruce and Steve. "WHAT THE..." Bruce and Steve shouted and ran... well dropped as fast as they could. The crowd was gaining on them. Mr Zapdos was telling and blowing his whistle at the crowd and the crowd was shouting back that they couldn't control themselves. " HELP!" Shouted Steve and then a crack. Wanda immediately stopped. "I broke my bone..." whimpered Steve.

Back to normal!

Natasha: we forgot that Steve was brittle.
Wanda: yeah.
Pietro: what must happened... I couldn't control myself.
Bruce: was this you? (Glares at Wanda)
Pietro:(being defensive over Wanda) are you blaming it on her just because of her mind control powers?
Wanda: Pietro-
Bruce: No but-
Pietro: BECAUSE IF YOU ARE I SWEAR THAT-
Wanda:(using her powers to shut them up) it... was... me.
Pietro: You're full of jokes. Of course it wasn't you.
Natasha: yeah. It wasn't all your fault. I came up with the plan and dragged you into this.
Wanda: Well, it was my magic that caused Steve to break his bone.
Steve:(walks up to the four with a sling) I'm fine. Wheres everyone else? What caused that job?
Bruce: ask them.
Wanda:(looks down at the floor) I may or may not have controlled the minds of the crowd to make them chase after you for fun...
Steve: YOU WHAT?
Wanda: We forgot how brittle your bones are.
Steve: We? Who's we?
Natasha: me and Wanda.
Bruce:(whispers to Steve) we'll play a trick on them as well. Revenge. Sweet delicable revenge.

People who have watched the first captain america movie with Chris Evans will realise that the picture above is Steve before the experiment, hence why Steve is brittle