Just deduction and working backwards while looking at the levels...
The demon ground pounds after 1st, 2nd, 3rd and 4th placement as long as you don't add water.
If you don't have water by the 4th he punches a hole underneath the tower and locks it out of leveling.
Then the tower has 4 floors maximum, starts with 1 and needs at least 3 turns after placement to level up all the way.
So it would follow that it goes...
You work this out very easily. It's intuitive.