This incomplete mutation wouldn't reveal too many abnormalities on ordinary days, but during the critical moment of evolution, it could become a significant hidden danger.
For evolution is essentially a leap in the life level.
The Fire Ear Bear could evolve into the Poison Fire Bear, but the Fire-tailed Bear could not.
Therefore, Firefly, with some power of the Fire-tailed Bear remaining in its body, would inevitably face the backlash of the Fire-tailed Bear's power during evolution.
At this moment, Firefly was in such a state.
Under the stimulation of the evolutionary resources, it was amidst a stand-off of the racial powers.
Win, and Firefly would completely stabilize as a Fire Ear Bear, hence successfully completing the evolution.