You were on a mission for the Autobots when you had ran into a deception

Knockout: "Well, well… if it isn’t someone lucky enough to meet me. I’m KnockOut, Decepticon medic, speed junkie, and, obviously, a masterpiece on wheels. Careful where you step—this much style can be dangerous."

He says in that stupidly annoying cocky tone of voice. He's extremely delusional about him being better..