"No, no, yes, yes but when I did that I think I may have had an inadequate understanding of car engines because it started smoking."

... Honestly he also has an inadequate understanding of car engines.

"So you can stop parts of objects, but nothing that your power can't conceive of as 'an object'. Do you know what force it takes to move objects that you have stopped, if any?

"I've never seen it done. They can still be compressed, though, if I stop a kernel of popcorn you can step on it and it'll support your weight but it'll flatten."

"Well, one of our gadgets -" he points at one of the machines on the wall - "is for applying a lot of force in a small area." He points. "I've got a penny here -" he pulls one out of his pocket "- if that's a test you want to make?" While I think about the best way to test some of the more complicated powers?

"Sure." She heads over to the machine, checks out what directions and locations it looks best placed to apply force, and leaves a penny in the air in such a location.

The machine's fairly simple; there's an extremely well-braced tray you put things in, and then a sort of a stamp designed to put pressure on them.

It presses down with rather more force than it would take to lift a car, and the penny is now flatter. Has it moved?

Nope! It's just flat now. It continues to hover an inch above the tray.

"... Well, that's the heaviest-duty press I have. I'm not sure the Survivor couldn't move it, but he's not available for testing -" he pauses "- world's strongest man."

Obvious next question - "Do you know how long you can keep an object frozen for if you don't release it?"

"If I don't want to use my spell for anything else and I just leave it there it stays till I fall asleep. Or I guess if something makes me less pretty I'd lose it."

... Okay, the prettiness thing is bizarre, but it's not like it's the only bizarre superpower restriction.

"It can stay frozen even if you leave it alone and stop paying attention to it, with no focus required?" Which would not be unique, but that combined with it ending when she sleeps would be odd...

"Yeah, sometimes I stop a pillow and sit on it. Once our towel rack broke so I hung mine in the air and it'd fallen by the time I came home since I used my spell on other stuff, but not before it had time to dry."

O-kay. "I'm sure there's some sort of industrial job that would love the ability to turn a bedroom sheet into a completely immovable surface and would be willing to pay you to come in once a morning to do that, I just don't know what."

He pauses. "If you want to test reaction times with the power, we have a pitching machine in the corner, but I don't know if you expect that to be relevant to your life." Also guns, because pitching machines have limits, but those are to be used with EXTREME SAFETY so he doesn't bring them up immediately.

"Once a morning wouldn't work out very well - I have terrible balance and tend to catch myself with magic when I slip. I could try to get in the habit of conjuring myself a pillow instead but I'm not currently in that habit. I try to live my life in such a way that knowing my precise reaction time is not very relevant."

He nods. "Perfectly reasonable."

He pauses. "In that case - range tests aren't very practical here," since it's a basement, "but we can see about targeting tests. If I show you a deck of cards and then shuffle it, can you freeze the card that was on top when I showed it to you?"

"Huh, I haven't tried that one. Maybe. A card might be thin enough to cut you when it's stopped, so be careful."

He nods. Shows her the top of the deck, backs of the cards all alike, shuffles, holds the deck between thumb and forefinger of one hand, other hand held below to catch it when he lets go. "Now."

They all drop. "Looks like a no. I don't know for sure but I don't think this is one my power's likely to change its mind on if I get prettier."

He nods. "Do you think it's just a matter of keeping track? If I used two cards, could you do it? Or if you saw the face first?" He's happy to test these!

She will test them, but it turns out she can't do it if the cards are mixed up even if there's only two.

Unfortunate! He's out of targeting tests; he recommends she should check range at some point on her own, maybe with city blocks somewhere they're a regular size, but he doesn't have the space for that.

Next step: Shapeshifting. He'll try the moderate and reasonable and sane tests later, but first he wants to know if she can turn a very tiny patch of skin on her hand into carbon fiber, a substance that could still exist according to the world that ran on the laws of physics, even if the only way to get it in this one is to have someone with the right superpowers make it for you.

"I don't think carbon fiber is an organic substance? I mean, it has carbon in the name, but in the sense of being a thing that could grow on an organism."

"I don't think so, no, but there's a small chance your power might disagree."

And if it doesn't, they can try a very light patch on her clothing.

"I am really really reluctant to try modifications to my body that I don't remember having heard of anyone safely doing because if it turns out they're too far off baseline the thing that happens is I permanently lose my continuity of personality and fuck off into the wilderness to be a dragon or something."

"Understood, I didn't realize it was that unsafe. You're completely right to do that and I apologize."

"Thanks." She can do carbon fiber clothes if she has a picture to look at.