No, the leg will not deform when you step on the accelerator obliquely, but try to step on the accelerator. It is easiest to exert force when pedaling. When you pedal, most of your feet are on the brakes, making it easier to step on the bottom. If you pedal obliquely, basically only half a foot or even toes will be on the pedal. This situation is more suitable for stepping. If you want to step on the pedal to the end, it will be more difficult and there will be safety problems.