The word iysh "fire" with the letter iod in the middle represents someone who is following the commandments, obeying the pact of fire (sexual purity), who stands in the midst of the fire of the furnace and is not burned (Daniel 3). Furnace is etymologically connected to the word "fornication".
By preserving our inner Noah, our divinity can purge the impurity that traps us in suffering. That inner fire, Noah, has to be protected in the ark-anum- the secret knowledge- within which he will float upon the waters that consume all impurity. The water and the fire work together.