Miami Dolphins linebacker Koa Misi raised hell at a Florida nightclub -- knocking down a clubgoer with a massive strike to the head ... before trying to run from the scene, this according to the police report obtained by TMZ Sports.
The report was filed by a Ft. Lauderdale police officer -- who says he was working a detail at Cyn nightclub around 3:41 AM on Sunday morning when he witnessed Misi and some friends get into an altercation with another group.
FYI, Misi is in the middle of a 4-year $17 MILLION contract.