What SFX does a Shulker make when you hit it?

It plays the entity.shulker.hurt, but what is that more generic hit sfx layered on top of it? I'm trying to disable that sfx via a repeating command /execute as @a run stopsound @s master _ but I don't know which sound it is so I can stop it. I've tried all the entity.player.attack._ ones already