how to make a jumpscare screen?

[Radical Batz]

I found this in the code of the sewer of the part where you open the door with lots of grunt parts and it did not have void my func, it had this instead

void CollideGruntCorpse(string &in asParent, string &in asChild, int alState)
{
GiveSanityDamage(10, true);

PlayMusic("20_event_darkness.ogg", false, 1.0, 0, 20, false);
}

should I use that? and in the level editor of the sewer it had a script area near the door called "AreaGruntCorpse"