I thought he was playing with Finn because he took him out easily as soon as finn cut him. He was trying to get rey to come to his side so he was not trying to kill or really hurt her. Kind of like vader and luke in ESB.
He totally played with Finn, and was beating Rey for like 80% of the fight - while he was bleeding out and everything... Nasedo is either trolling or couldn't understand what's clearly shown in the movie lol