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There was a 500 Miles Friendly Kart race here in Brazil and when there was 19 laps remaining, Felipe Massa overtook one of the contenders to win the race for P1, and then one Backmarker from Massa's team started to hold the P2 behind so Massa could get a bigger gap.
Because of that, the P2 team ordered their backmarkers to take Massa out in some form of retaliation and then Massa's team ordered the other backmarkers to fight back on this.
In the end, 2 Karts Crashed, one from each team and they started to Fight on the middle of the track.