This is how I think teenage boys would really react to the sight of their brother's bloody wound.
"How did this happen again?" Donatello asked his brother as he dug the needle into his scalp and pulled out the black thread. He wondered if he should practice sewing so that he could make their scars straighter.
Leonardo sighed. "I was hit with a brick."
Don groaned as he heard Raph and Mikey running down the tunnel. He braced himself for their reaction. No matter how hard it got and how badly they reacted, he must not be distracted.
"Hey, Mr. Perfect," Raph said. He was eating a candy bar and slugged Leo on the arm as he passed. Apparently, he hadn't noticed the blood all over Mr. Perfect's head, face and shoulders and the thread being pulled through his scalp.
Mikey picked up Leo's bloody bandanna from the kitchen table. "Wow, what happened to you?"
"Holy shit!" Raph exclaimed, grabbing the bandanna away. "How am I going to get this clean? Why didn't you soak it right away? Do we have any hydrogen peroxide?"
Don rolled his eyes and heard Leo yelp in pain as he pricked his skin as he took his eyes off of the needle momentarily. Raph had a strange Zen-like relationship with their laundry.
They both flanked Don, staring at the thread as it went in and out of Leo's skull. "That's so cool. Think we can see the bone?" Mikey asked enthusiastically.
"Nah, it ain't deep enough," Raph said with a definite hint of disappointment.
"Don't everybody get worked up at once," Leo mumbled.
"It's really deep," Don observed as the gash disappeared under the gathered skin folds.
"Think we could stick a penny inside?" Mikey asked, looking around for change.
Blessed silence. Well, not completely silent. Raph was munching loudly on his candy bar. "You'll have a really funky divot on the top of your head, man," Raph said.
"There goes my modeling career," Leo said, crossing his arms. "I can't believe somebody threw a brick at me. They threw it from a city bus. What's up with people?"
Raph snorted and spat bits of nougat all over the top of Leo's head. Don buffed it away with his fist.
"What were you doing?" Mikey asked, holding a penny suspiciously in his fingers. "Waiting at the bus stop?"
"I was hiding… ouch!"
Don tugged on the thread, tightening it before he tied it off. "Sorry."
"I was hidden."
Don clipped the thread and Leo immediately felt of the area, wincing. "I can never get used to that feeling."
Raph jabbed his fingers at the wound. "Look at this huge blood clot. Want to see it?"
"Yeah, sure."
"Let's take a picture of it and send it to April!" Mikey said as Raph hunted in the utensil drawer for a spoon.
Don couldn't argue with such a brilliant idea. He could see the responding email. What the hell is that? Are you okay? Wait, is that you? Who is that? "Let's make her guess who it is," he said.
He and Mikey hunted around the living room, looking for the camera. Don could hear Raph say, "Do you think we could balance a marble in your divot after it's healed?"