This timeline is after a bunch of playing tails slowly had enough being killed over and over and over again sometimes by other exes

He simply had enough after being killed again something in his code changed his left eye began corrupting after the corruption he had the power to defeat this ugly sonic redraw so tails confronted the fake sonic in the game over screen

After tails won he killed sonic.exe and put his head on the spike where tails's head should be and now hes trying to kill every other exe