I cut off the suffering man's leg
Are you being serious?
I'm serious about this.
You aren't a doctor, so you arbitrarily deciding to amputate his leg was wrong. Now this man's life will never be the same again.
I had no choice! He was suffering!
It would have been better to take him to the hospital first and let the doctors decide whether or not his leg needed to be removed. You should make sure that this man gets the help he needs and that you haven't caused any long-lasting damage to his wellbeing.