The evolution was a dangerous process that every warrior had to undertake seriously, after countless preparations.
After all, the process was meant to elevate and transform the very nature and composition of someone's existence. Failure would almost always lead to troublesome and potentially deadly mutations, which would prevent the warriors from attempting the evolution again in the best-case scenario.
Colonel Norrett was one of the best-case examples. His failed evolution didn't kill him, but it left him internally scarred and partially mutated, a state that humankind didn't know how to tackle.
If it weren't for Khan's discovery of the toxic substance on Baoway, Colonel Norrett would have probably never gotten the chance to attempt the evolution ever again, let alone succeed at it.
