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Heidfeld told AUTOSPORT: "It doesn't help me. It would have been amazing to come away from the first Formula E race with a victory, but instead we are leaving with nothing except a damaged car.
"I had been saving power and got a really good run out of the second to last corner; I was better on braking for the last corner and he braked early anyway.
"I was next to him and he moved over on me. That is clear, but he is a friend of mine [and team-mate at the Rebellion Racing World Endurance Championship squad], so I know he didn't do it on purpose."
Prost, meanwhile, accused Heidfeld of "totally overcooking it".
"The speed of the impact [with the wall] shows that he was going too fast," he continued.
"I was just starting to turn in at that point and he tried to dive-bomb me.