Minecraft 1.14 - Kill two random arrows when shot from a crossbow with multishot enchantment

I’m trying to create a command that will kill two random arrows shot from a multishot enchanted crossbow (that shoots 3). I wanted to make a bow that would either shoot only left, middle or right. I tried this by adding a scoreboard called
CBOW which detected when a crossbow is shot and ran this command on a repeating command block:

execute as @a[scores={CBOW=1}] run kill
@e[type=minecraft:arrow,limit=2,sort=random]

this does not work for me, so does anyone have any suggestions or fixes?