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Karl Bruner was the head of the Swiss Guard security for the Pope.
The Confessor Edit
When Brunner saw Gabriel, he recognized him from the photo that had been circulated of the "papal assassin" and attacked. He backed off only when ordered to do so by the pope. Brunner told Gabriel that protecting the pope was his (Brunner's) job.
The Messenger Edit
Bruner was killed in the attack on Pope Paul VII.