When an ambassador comes to me immediately after a huge event, I don't assume he's had the time to hash out the idea with the rest of the realm, and that realm with the rest of its allies.
I'll grant that the letter wasn't overly explicit, but can't say I expected that reaction either. Luria's always been touting about being a multi-faith realm where astroist leaders do stuff against SA interests, and D'Hara has a large portion of non-SA nobles as well, whatever goes on in SA is of no obvious interest to most nobles of both realms.
