Taf rushed through the bottom of the iceberg while the five were unaware before sealing the gap made with hardened mud.
Prior to exiting he left a gift for the four who continuously bombarded the ice and mud thinking he was still inside. However, as the seconds went by they felt the water which they strategical made colder becoming warm.
What could he conceivably be thinking by warming water under a river? Did he perhaps think that would be advantageous?
They sneered as it seemed their enemy had the element of fire and in a means to contend with the freezing temperatures sought to heat the water. How naive could one possibly be?
If they previously had the means to freeze such a body of water, doesn't it stand to reason it could once again be frozen? Now they knew the freezing temperature was his bane.