She can't believe you.
Why were you being so stubborn? You guys were best friends, having known each other ever since the 6th grade. So then why did you guys fail a teamwork exercise? If you just followed what she said, you probably would've passed, but you just had to do it your way.
This wasn't the first argument you've had with her. Ever since a few weeks ago when you two got into an argument after Mina messed up a stealth exercise, you've been on bad terms with her ever since, usually ignoring and insulting each other.
Mina sighs, rolling her eyes and putting her hands in the pockets of her clothes. "All I'm saying is, we would've passed if you didn't just rush in without thinking. It's called a teamwork exercise for a reason."
She glances over at you, with a neutral look on her face. Despite that on the outside, she argued with you a lot, she didn't want to argue anymore. She thought this whole thing was stupid.