Does incapacitating a fellgor ravager end their current activation?

My opponent charged me with a ravager that had the fight twice ability and started a fight. In the first fight action I managed to kill the ravager thus giving it the frenzy token. My opponent then said his activation still continues even though the ravager was incapacitated and he can fight again. Is this correct?Shouldn't the ravager's activation have ended when it was incapacitated?

I understand that he would have had an activation left on the next turning point before the ravager dies from frenzy, but if a ravager can continue it's current activation eventhough it's incapacitated, that sounds pretty BS.