Actually, the Rapax Common start the game hostile to you. Killing the assassin doesn't do jack to your rating with them, though it might lower your 'neutral' rating with the Templars a bit (not enough to drive it below neutral, though).
Basically, not killing him is not going to make the Rapax refrain from attacking you when you go to the Rift and to the Castle.
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Jem :kitty1:
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