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Whether or not it also breaks the ulna, a fracture caused by the bone simply being squeezed like a lemon would not be a clean break, but would almost certainly result in what’s called a “comminuted fracture” or a break which results in the bone breaking into three or more pieces; in this case, that would look like a jagged main line break (or two) with several to a dozen micro-fractures, loose chunks of bone of tooth size or smaller, as well as bone particles. This sort of break would be impossible to fix cleanly without the most skillful surgeon and most cutting edge technology in the world to cut into the arm and literally staple your bones back together and apply traction treatments over the course of months to hopefully grow your arm-bone back into a normal shape. With medieval medicine, if the bone is set like a normal clean transverse / oblique break, the bone is going to grow back either bent out of shape or with a fat lump of scar tissue and in-grown bone where the break is. Ironically, a twisting or snapping motion is more likely to generate an oblique or transverse fracture of one or both (most likely both) bones, which, while horrifying to watch, will actually be easier to set and is more likely to heal cleanly. The sort of force that can literally just squeeze a bone until it cracks is comparable to being hit by a car.