[Nearly Free Clinic]

Seraphina, who does, in fact,.recognize an MRI, gives the supervillain 50-50 odds, where he is 50% likely to seriously injure himself because those magnets are a LOT stronger than he's expecting, and if he manages to not disable himself, she thinks the other 50 is that he breaks everything. Either way, she doesn't think this'll go as he plans.
. . .
She also wonders if the supervillain knows the difference between an MRI and a CT machine. If he came for one and mistook it for the other, that would be very unfortunate for everyone. Regardless, she's pretty sure the giy's going to end up disappointed and leave a lot of people in need.

Noticing that she's getting pointed at with a gun, Seraphina stops moving.

Luckily(?), Seraphina doesn't have any money. She does have two rings, though...
The ring on her left hand is one that she's unwilling to part with, but fortunately that hand is the one that is keeping pressure on her wound. So that ring is pretty much unnoticeable.

Her other ring, on the other hand, is pretty exposed. It's the snake one she found on the beach. She's not sure how valuable it is, but...maybe?

She shifts all the things she's holding over to between her chest and her left elbow. That ring is a little big for her, so it should be possible to get it off with one hand.

Seraphina walks forward towards and holds her now-empty hand out, palm facing the flying thief. The faster she can get away from this situation, the better. She uses her thumb to loosen it and start to move it up. "All I have of value is this ring, is that fine?"