Walking zombies in RottenV?

I am messing around with RottenV and I’d like to change the zombies so they walk. I already know that you can change “SetEntityMaxSpeed” in zombiespawner.lua but that just makes them look like they are running in place and moving slowly forward if you set it low. I was wondering what needs to be modified to actually make them walk?

This is the zombiespawner.lua file: https://github.com/Bluethefurry/RottenV-Remade-Basic/blob/master/client/spawners/zombiespawner.lua