Pati and the others kept moving as they butcher Walkers along the way with ease.
Despite Dinda being a support role on their team, she still needs to level up so that she can keep up with the others. Because of that Jeff mostly kills the Walkers while the Heavy Walkers are killed by Dinda to help her increase her level.
With the weak Zombies getting thrown by the world, Pati doesn't need to fight at all.
Only the strong ones can even pique Pati's interest, Zombies above level 30 are desired more since they certainly provide stronger items and also more exp upon being killed. Walkers and Heavy Walkers are nothing for him.
From how high Pati's stats are right now, he might even be invincible around both Zombies.
Although he's not going to try there's a possibility that Walkers are not able to leave a scratch on his skin, Heavy Walkers are also a possibility. If he evolved then he definitely wouldn't be worried.
