(Yes, it's an completely reasonable decision that he would not change, it just bothers him anyway to be unable to see the sunlight.)

Then he will pick a curious-looking group to sit with.  (The alternative being standing in the middle of the room and introducing himself, which is sometimes done in Mendev but would be... what was it the Select said... strange to the point of comedy, here, he's pretty sure.)  He even manages not to smile at them. 

"Marcus Aemine, from over on the Mendevian line. I'll be staying around for a while."  He wears Iomedae's symbol in the distinct paladin style, on his shoulder rather than a necklace, so they can probably tell that much, unless paladins are even less familiar around here than Guiu's list implied.

"Here to tell us all right from wrong?"

"If you like. Not planning on going around lecturing people."

"But you don't say you won't, only you've no plans."

"I think I won't – if you've been serving under a Select with the Lastwall rulebook for months you're probably not doing anything that'd inspire me otherwise. But I won't tell you something might not surprise me."

"So you lectured the fellows one over, then?"

Snort.  "Goddess, no.  D'you think it would've worked?"

"Maybe you're ever so Splendid."

"Well, let me know if you start feeling like a few minutes' conversation is making you want to abandon your mildly Evil hobbies, or whatever it is I should be lecturing you about."

"There's evils what are mild?"

"Oh, there's so many, you've got no idea. It's not that you've gotta not do any, just do more Good things than Evil ones and it should all go fine, but if you're short on Good things it'll help to be careful. And if you're a paladin you've gotta be careful all the time."

"You've gotta not do any, what trifling little evils have you got on your list to not do?"

"Oh, you know. Writing mean letters. Being careless spending an official budget. Touching Chelish soul money at all, probably. Insulting people when there's no call for it. For all I know excessive lecturing might count."

"The budget's Law, not good," says another man at the table.

"It can be both sometimes, but you're right. I'm lucky being careless at conversation doesn't count."

Taberner produces a paper half-dollar. "Dare you."

Marcus stares at him, hands firmly in his lap.  "...All right, I will grant you this is a little funny, but I'm not going to be an idiot about it and I suggest you try that too."

(Tarlev thinks it's more than a little funny. Snicker snicker.)

"Taking our pay is stupid now, boys, take notes."

Unimpressed look. "Well, depends if you're handing it to paladins. I imagine most of you've got better things to do with it."

"Wasn't planning to let you keep it."

"I figured you weren't, and I figured having it for a moment without using it wouldn't do anything, but I've been known to be wrong about things. So I try not to have the sorts of habits where if I'm occasionally wrong about something I won't last the month."

"I thought you'd get a little warning, a bit."

...Oh. Of course people would think that. It's a lot easier to imagine.

He raises his voice slightly, to make it easier for the other tables to hear.  "No, that is not how it works. I wouldn't be looking at you like this if it was. We don't get warnings, we just Fall, after any single Evil thing done on purpose, doesn't matter how small it is. I've seen it happen enough times to be really fucking careful."

A woman at the table speaks up. "Clerics don't fall for doing something nice even if they do it every week for years. Evil clerics I mean."