It was in an instance.
Danzel only managed to take a small glimpse, but the three zombies that he raised were eliminated in an instance.
Sure, they were beyond weak compared to his standards.
In fact, if someone were to fight with a clear mind against them even if he had the same stats as the zombies. That, someone, could probably take 2 to 3 zombies head-on, if not more.
After all, except for how scary they look and all. The zombies were only driven by instinct.
And their actual intelligence was rock bottom.
He once had tried to command them to hold and use weapons, but that didn´t work that well.
Overall, the zombies he raised were weak.
So finding them being decimated by someone else wasn´t much to his surprise. The surprising part was the one who did it.