"Through, return to your power confined!"

And now can he sign his name on this card?

He can. He can also have an incredibly baffled and angry lady wanting to know why he has just ruined every single food item she possesses with witchcraft.

"Oh, sorry, ma'am. I can replace all of that for you, if you want!"

...well she's not going to refuse.

"Um, where can I find the nearest grocery store? I usually don't come down this way."

She has directions but looks suspicious.

He leaves one of his signed cards on the table (the Flower) and promises to be right back with her food.

He retrieves groceries.

He'll return to a bewildered lady in an apartment filled with flowers.

"Here's everything you asked for, ma'am."

He proceeds to put everything away for her, unless she'd like to say something about witchcraft again. 

No she's good thanks please go away.

Great! He'll just take the card and go.

Yes please go away and never come back.

The crowd has mostly dispersed by the time he returns to where the magic tricks were happening.

Convenient. He waits for Sadde to finish up.

"And that, ladies and gentlemen, was the end of it. Don't forget to like us on YouTube, and leave your comments and feedback!" He bows, makes a sweeping motion with a cape (where did he even get one?) and disappears. The crowd applauds and starts dispersing.

Others do not disperse.

"You put on a pretty good show."

After everyone's gone he reappears. "Thank you. I do try."

"Did you find the Cards?" Kero asks Scott.

"Yeah. I met an old lady that thinks I'm into devil worship and witchcraft. Hopefully it won't be a problem."

"You- you're so- it's probably fine as long as she wasn't one of us."

"You're sure you got all of them? What was that about, anyway?"

"She saw the Flower in action, and she saw me catch the Through. She seemed nice, besides the witchcraft comment."

"Well, if we're throwing secrecy out the window, let's do it in style. I think I like Sadde's sense of style better."

"Thank you," he says, grinning. "So now I think we should edit this and upload, yeah?"

"I'll take care of it," says the otherwise useless party member.

They make the news.

Or, not them in particular, and not even, like, breaking news or anything, but a lot of people in the city are reporting surprisingly internally consistent reports of actual magic. Stage magicians is, of course, the natural conclusion, but the video goes viral pretty quickly anyway, especially due to the fact that lots of other people were recording it on their phones too and can corroborate the sheer improbability of all of that having been staged.

There is a knock on the Argents' door the next day.