Did the motor feel hot when it landed?? Was the smell definitely from the motor or the ESC?? Use a digital ohm meter (I kinda forget everybody might not have one laying around..) to check the winding wires.

But if you smelled burning stuff, something is not right. I'd still be more inclined to think it was the ESC..they have some fragile little bits in them compared to a solid piece of wire in a motor. If nothing else, if the motor did burn up first, it prolly took the ESC with it. But if the ESC itself fried, your motor prolly survived.

I wouldn't try to run any of it if it's smelling burned.