Hpi Bullet MT with hpi flux shot 9t 4300kv brushless motor CRASH

hpi flux shot 9t 4300kv brushless motor CRASH went with friends on the race track in Kiev, but after a couple of laps lost traction and came wheeze. I had thought that this sleeper, but to understand the box gear, found that the problem in the engine. as you can see in the video. new motor models with Bullet MT, spoiled, it has broken-magnet on the rotor, without excess load under normal driving.