He doesn't swim naked, so he takes the summon anyway.
"That's very kind of you!" says Cam. "I appreciate that. I can produce handbooks and manuals too but it's easier if I have title and author."
"Thank you," says Cam, producing a copy and tucking it into his computer. "I'll read that before I attempt to fly away."
"Hi!" says Cam to the guards. "I hear you're supposed to ignore me. That means that if you react to me trying to enter this building you'll be disobeying the consensus. I'm not sure what sort of consequences that has but I bet they're not designed for your comfort!"
Ooh, a representative! Cam stops and waits politely. He's in a good mood. That Officer Eitamek only made two and a half racist remarks over an entire conversation! And was angry at Cam over air traffic control regulations!
"Oh. In a broader sense, my business here is that your civilization is collapsing and I would like to see if any of it is salvageable and compatible with people other than your species continuing to be alive, and do my best to help salvageable parts survive."
"I also want you to stop murdering people, which you seemed to be doing when I looked."
Cam pulls up some of the video he took of the ritual sacrifice. "Ring a bell?" he asks, displaying it.