人摔了出去　人 is my body. Is it common?
According to dictionaries, 人 here means this sense:


  （人的身体或意识） state of 
  one's health; how one feels:
  
  When the patient was taken to hospital, he had already lost
  consciousness.
  
  送到医院，(他)人已经昏迷过去了。
  
  I haven't been feeling well for several days.
  
  这几天我人不大舒服。


In your context, it means the sense of one's body. It could be also referring to one's feelings/consciousness(see the above example).

It is a pretty common usage of 人. Let's say when I say 我人不太舒服, I might mean 我身体不太舒服, feeling vomiting, headache and etc.