Stan1953
Member
Actually they were described as "tongues", that appeared AS fire. It wasn't literal fire.No the Apostles were not writhing in pain.
If the fire was physical fire they would have been.
Hence the difference.
Spiritual fire can have different effects on different things.
http://www.biblegateway.com/passage/?search=Acts 2:3&version=NIV;NRSV;NASB;NET;MOUNCE
However I get what you are saying and again context is always of highest import when reading the word.