Self terror annointement on weapon question

I have a weapon that give on action skill end apply terror to youself and my question is if i hold this weapon and apply terror to myslef hen switch to another weapon that has the annointement while terrified gain increase dmg will it work ?

Yes, but its 1 stack every 5 secconds over 18 (can only have total 3 stacks), it may stop stacking if switched to early though - i dont have that on any weapons; only grenades and shields