Mercy/Slaughter Rule - game continued then stopped

[digher38]

Girls SP championship game. At the bottom of the fifth, mercy rule comes into effect, visitor losing. Both managers are aware, team that is down wants to continue play. Ump says so long as losing team is willing to continue, ok. Sixth inning starts. In the middle of the visitor's line-up, an ineligible player bats, hits a HR & two runs score. Home team protests player, ump sends one runner back to base, calls batter out. Play continues. Visitors score 6 runs, mercy rule no longer in effect. Home comes up to bat. Has one runner on base & batter in box. Home manager then screams that the game was over on mercy rule and pulls his team off field. Umpire now says official scorekeeper didn't notify him of mercy situation & calls game with home team winner.

Is this a win for home team by mercy rule or a forfeiture by ego win for visitor? (League rules state: Once a game has started, managers cannot intentionally forfeit a game by removing his/her team from the playing field.)