I know that Jehovah's Witnesses do not believe in hellfire but in that case, how do they interpret scriptures such as Revelation 20:10, which says
And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and shall be tormented day and night for ever and ever. (KJV)
According to Jehovah's Witnesses, what is this verse a description of?