[What's_nitro?]

So the wire was out when you plugged the battery in, you didn't notice it, and it fried when you gave it a little throttle? That makes sense then- the motor was probably acting like a short circuit with only one phase getting power. Sounds like an easy mistake. The Medusa was not sensored. In this case the T8 motor is sensored and so the sensor wire kept telling the ESC to send power when throttle was applied.