Well if you were concerned about which I could have told you that long ago, says right there in item.txt
Code:
filter {
belligerent=ally
unit=archer,bowman,cannoner,catapult,elf,elf2,goblin
}
We're just discussing why they made such a selection, they probably considered how the item fits, hence the scope only affects medium-sized humanoids, anyone else couldn't use it.