If the player is accidentally destroyed by Anton Nasser during a mission, the player gets one free revive. Or maybe just give the player insurance for any reason during the mission, since they're doing something important.
And if the player completes the mission without using insurance, they get a bonus reward.
Just make him 'no friendly fire'.
It is so bad that I approach or leave behind the stargate in Silla to avoid getting killed and I wait a long way away until he has killed off all the incubating chimeras at the infected station and then approach.
Gunsan isn't a problem because the playership armor has been upgraded by then and can handle being hit but in Silla he is your worst enemy.