So you are using Tibia client's Auto-Chase mode (the green guy icon) - it won't move through fire/energy/poison/etc. fields. It's designed to not move through these.
You have to disable Tibia client's Auto-Chase mode (use "Stand while fighting" mode - the red standing guy) and do as Spiff26 said - remove all creatures from the Killer's list and add them again with Distance: 1
Now it will move through fields.
You have to disable Tibia client's Auto-Chase mode (use "Stand while fighting" mode - the red standing guy) and do as Spiff26 said - remove all creatures from the Killer's list and add them again with Distance: 1
Now it will move through fields.