Playsound at SetEntityPlayerlookatCallback?

[Tiger]

So, There's a part where I want the player to look at a decal and they'll hear a sound and get sanity damage(No, it's not a jumpscare, trust me). I've tried coding this script kinda from scratch, but also used this.
I've checked the wiki, youtube and tried googling it but I can't find anything about it. Here's my script right now:

Spoiler below!

OnStart()
{
SetEntityPlayerLookAtCallback("blodsplat_1", "screamtrigger", true);
}

void screamtrigger(string &in asEntity, int alState)
{
PlaySoundAtEntity("", "21_scream5.snt", "stove_1", 0.8f, false);
GiveSanityDamage(10.0f, false);
}

the "blodsplat_1" is an entity-decal and I've changed it's "playerlookatcallback"-box to "screamtrigger". I've tried solving this for over an hour now and I'm starting to get frustrated
I would really appreciate help.