Can someone explain this??

Let me start of by saying I have fiber internet. I havent ever lost connection in any game.

This match starts off but i can tell something is wrong the game was moving alot faster than other normal match.

I was winning the match the whole time. I was maybe 2 more blast cards away from killing his goku/vegeta tag unit then all of a sudden the screen glitches and that connection screen pops up and I get that error message. I havent ever got that message before. Then I tried to replay the video and that doesnt work either.

Im assuming he cheated some type of way like rage quit.