The dim lighting made it easy for Rinion to walk straight into the "pit-fall" trap, it caught him off guard and he fell straight through the rotten wooden boards into the black abyss below, " Run!!" he shouted as he fell deeper then vanished.
Apart from Rin vanishing there was one other strange event.
The noise of Rinions fall had invited several hungry visitors, and with only the exit to choose nobody was to blame.