マスター セルシア:
The Giran official who was attacked was not a follower of Beleth, and...
Beleth intentionally slipped the information on the Giants' Research Documents to the Ivory Tower Wizards.
Knowing that they would be thrown into conflict with each other, he could then take advantage of the situation to take the documents for himself with no one the wiser...
"Those are all the possibilities I can see..."