But was that how he lost his arm? Or was that how he ~left~ the show? I forget.
Mine?
See, Rocket was up on the roof off-loading a patient from a helicopter when he raised his arm to wave, and the helicopter's tail rotor severed his arm just above the elbow. They tred to reattach, but it was ultimately unsuccessful.
A season or two later, he was out in the hospital's courtyard when a medical helicopter fell on him.