Now, you're guilty of oversimplification, too, for while foot rise is the most visible and obvious component of rise, it is only one of four: increased elevation created by bracing leg muscles; straightning of the knees; stretching upwards of the body AND raising the heels from the floor. The cumulative effect of the NFR elements are greater, arguably, than foot rise on its own (not that you could, ever, have foot rise only), but on a FT Reverse Turn we have lady "rising slightly e/o 1 NFR", which is slightly different from both suggestions on the topic.