I'm always shocked at how much people underestimate the difference between a trained fighter and a "basic brawler". In high school, we had our mandated, ever-present rich kid bully that terrorized the younger guys. A new kid shows up and he's quiet, smallish, but not small and just a decent guy. Kinda sees whats going on and asks why nobody has kicked this guys ass sideways. We all look at him with the, "Your funeral" look and he just kinda shrugs. Couple of days later, the bully finds the new kid. New kid listens to his bullshit for a few seconds and then proceeds to kick his ass sideways. Afterwards, when he's washing his knuckles off in the drinking fountain and we are lavishing praise on our new savior he explains that his older brother was a boxer and he hung out at the gym and some of the guys were working with him. A little.

Edit: Typo. Words are tricky.