As time passed, Wild Tycoon was getting used to dealing with the Boss and getting more hits, but HASTE's effect was near its end.
They couldn't escape, as the Boss would cause too much chaos now. However, an evolved monster could go through floors and could even escape the Tower.
Tower monsters were normally sealed on the floor of their creations. While in the Tower, it seemed to weaken every monster, but they earned more of their genuine power with each Evolution. When they got out, it allowed them to reach their true potential.
There was an escape once in the past, and it took many Players to work together to defeat it.
He couldn't let this monster evolve more, or escape from the Tower, even if there was a significant chance that the Dark Guild could deal with it.
Those creatures were of significant power and danger, but great danger meant great reward.