Just RNG.
I would suggest trying 5-10 times. If you don't get the parchment, camp and wait for them to respawn at 8 AM or 10 PM.
Spamming for 20 tries will just get you killed. Personally I stop after 4-5 tries and try again later since there is a very high chance he spawned without the parchment if after 5 tries he didn't give me it.
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