Force player to follow enemy until it disappear help.

[Adrianis]

Not sure about this, but the callback you set in OnStart, this...
AddEntityCollideCallback("servant_grunt_1", "StareArea", "StopLook", false, 1);

When the grunt hits 'StareArea', you are calling the function StopLook, which calls to StopPlayerLookAt()
If you're intention was to start the LookAt when the grunt hits StareArea, then the line should read

AddEntityCollideCallback("servant_grunt_1", "StareArea", "LookedAt", false, 1);
Because LookedAt is the function that calls to StartPlayerLookAt