I watched and understood the events that happened in the race. That's how I know. Marquez almost sits up on his bike waiting for Lorenzo to pass. Then he slows up in front of Rossi everywhere where passing is difficult, and attacks like mad when Rossi is ahead.Are you Marquez's engineer or perhaps God? How did you know for sure that Marc deliberately slowed Rossi down?
That's just Sepang. Philip Island was even more blatant. No need to be an engineer or to be God, you just have to understand racing, and MM's antics aren't racing.