I know how make a Stalker that disappears when u look at him

First Create a Procedure and select Player Update Tick.

Create Local Variables :

LookX

LookY

LookZ

Raydistance

all are number Variables

Create Normal Player Persistant Logic Variable : IsPlayerLookingAt(YourEntityName)

Then Create this Procedure in the one we created

Then Save and Close

You know u can check if the Logic (IsPlyerLookingAt...) True then do....

https://imgur.com/a/n601h8T