The worst fight for far in the whole series. Teacher Luo did nothing to that one zombie-brother she pinned down, instead she just left him behind, undamaged. She chopped off another zombie-brother's arm, but then just stood still, allowing the armless one to escape in peace. Furthermore, she did absolutely nothing to stop the zombie-brothers from initiating their fusion technique, even though she's familiar with the danger. Meanwhile Gao Fei was probably having a smoke, or something, since he didn't join the attack.
The author got extremely lazy with this one. It's impossible to take those three zombie-brothers seriously anymore.