Enoch spoke in the past tense because that prophecy was sure to be fulfilled. And ungodly humans did perish in a global deluge!
(‏ يه ١٤ ،‏ ١٥‏ )‏ تَحَدَّثَ أَخْنُوخُ هُنَا بِصِيغَةِ ٱلْمَاضِي لِأَنَّ هذِهِ ٱلنُّبُوَّةَ كَانَتْ سَتَتِمُّ لَا مَحَالَةَ .‏