The assassination attempt on Thor was a disaster in the making despite its failure. It didn't matter that the perpetrator never had any chance of harming the Nephilim queen; as their host, Sam had allowed someone with ill intent to make it so far. His negligence was unforgivable and thus he owed the otherworldly beings some kind of reparations.
Fortunately, the Crimson Queen agreed to leave that matter to another date. Sam didn't want to think about it too much at the moment, especially when he had to ensure the reporters who had yet to leave the hotel didn't get wind of the incident.