The power Jin Xuyan had just displayed was no longer at a level-two ability-user's level.
Based on how at ease he had been while fighting against that level-three mutant zombie, his level was at least four, if not higher.
Seeing that he was regulating his energy, Jiao Lizhi didn't disturb him and went to collect the crystal cores.
Both of them had already guessed that there was a level-three zombie nearby when they saw two level-two zombies partnering up to fight them.
Without the control of a higher-level zombie, two zombies at the same level would have killed each other instead of teaming up.
She had simply underestimated the enemy and was injured. This lesson snapped her back from her arrogance. Even if she was reborn and stronger than other ability-users, she was still weaker than the zombies.