The humanoid rat creatures that were left had wanted to stop them from running away, but they couldn't since they were being stopped by the zombies.
The zombies weren't that strong that they could defeat the humanoid rat monsters without teaming up.
In fact, it was even hard for them to stall the humanoid rat creatures since they were so strong. There were already a few of the zombies that had been ripped apart by the humanoid rat creatures during their confrontation.
However, the terrifying thing about these zombies was that they showed no fear in attacking.
They only existed to follow orders and once they received their orders, they wouldn't back down no matter what.
For now, the order that they received was to attack the humanoid rat creatures and stall them for as long as they could.
So as long as their bodies didn't break down, that was what they would do.