Ran until his legs were screaming in pain as well . Ran until even that pain burnt away and he knew he should be on the ground asphyxiating , gasping and wheezing and choking for air - except he was n't . He could run for - god - damned - EVER now .
According to the above context, answer the following question.
What may be the reason for him running so furiously ?


Adrenaline is coursing through them .