Third Party Witness to Creature

This incident was recently related to me in a conversation that I had with a friend.  Although it had occurred some 20 years ago I feel it is significant enough to mention.  He stated that while he was in a rooming house he got to know a man there that always seemed to be disturbed about something.  He also appeared to show a great deal of anxiety.
 One day while my friend and the man were talking the man admitted that there was a time in his life when he was normal as any other average person.  It all changed one day while he was hunting in the Watchung Mountains region.  While he was in the woods he encountered a creature that he described as being "not from this world".  It frightened him significantly.  He yelled at the creature to leave.  When the creature did not he tried to shoot at it with his gun.  However, the gun jammed.  This terrified him even more.  The man became upset during this part of the conversation and did not want to talk about the experience anymore.
 Since much time had passed my friend has lost contact with the man.
I have known my friend for some time and do know him well.  I have always found him to be a honest, level headed, and straight forward person.  He believes the man to be credible.  Also, the event affected him severely which seems to indicate that it did indeed occur.