In Mark 3:29-30 [KJV], we learn that calling someone's spirit "unclean" is unforgivable :
 "But he that shall blaspheme against the Holy Ghost hath never forgiveness, but is in danger of eternal damnation."  "Because they said, He hath an unclean spirit."
Later in Mark 5:2 [KJV], the author of Mark tells us :
 "And when he was come out of the ship, immediately there met him out of the tombs a man with an unclean spirit,"
If Mark 3:29-30 is literal, Did the author of Mark become "in danger of eternal damnation" by writing Legion's spirit was "unclean"?