KO: the injury, more commonly, or the Kick Off, sometimes.
Wussball: the agile approach of playing BB, typical of teams like Skaven and Elves, focussed on playing/handling/passing the ball, moving quickly, and on surgical strikes aimed at getting as fast as possible the ball, instead of plodding with a cage slowly to the End Zone, bashing opponents, carrying the ball without passing it at all, if not strictly necessary.
They usually avoid unneeded contact with opponents, and make use of screening/zoning (i.e. use their players to put a spread net of tackle zones to limit the opponent players' movements, without staying in their tackle zones).
Wussballers a.k.a. Agile teams: The agile (and often fragile) teams.
Bashers: their opposite, like Orcs, Dwarfs, Chaos, Nurgle, focussed on removing opponents from the pitch, and generally having limited ball handling skills. They tend to stand toe-to-toe with opponents (especially if they are agile/weak) and to entangle them in a block scrum.
Hybrids: teams that are a way in the middle between basher and agile teams.
Joke teams: weak (in terms of win rate %) comic-relief teams designed to provide the experienced coaches more challenging matches, like Vampires, Halflings, Goblins, Ogres.