Now that I’ve had a chance to see this again, there’s something about this foot that just isn’t adding up.
We’ve seen Garnet use her fists as rockets - it wasn’t out of the question that Peridot used the same tactic here.
BUT! Logic would suggest that Peridot’s foot would have dematerialized by now, much in the same way the gems’ projected weapons do when no longer in use or heavily damaged. Rather, Pearl’s holding the melted, smoking thing in the palm of her hand.
So clearly her feet must be separate from her and not part of her actual, physical form. I’m willing to bet that her hands aren’t her own, either. But she should still have a foot dangling where the boot came off, right? But no. So does she shapeshift to fit into the armor/prosthetics? Is this just how newer gems are made now? Please explain yourself, Peridot.