Immediate Security is created by Security Team, that is last physical barrier between attacker & attack target.
This is the deepest defensive sphere of 'the Security Ring'.
Main tasks of Immediate Security Team are:
- actively preventing killing of protected personnel,
- neutralizing attacks if/as they occur,
- constant awareness of people near secured personnel - which cannot be target of attackers.
(to be elaborated if/as i can).
-- Paraphrased from 'Taktyka działań ochronnych. Ochrona osób.' by Jarosław Kaczyński.
-- i've translated & paraphrased as well as i could & understood. it's best to buy book.
-- i've added a little of my opinion as well.