It looks like a typical inversion ankle sprain. If you do choose to wear a brace, make sure it is designed for such a sprain and NOT for an eversion ankle sprain.I was walking down a steep sandstone sidehill that I’ve hiked a bunch of times. Usually I wear my higher top hiking boots but I had tennis shoes this time. I broke traction and had to take a couple of big steps and rolled the right ankle which put all my weight on the left ankle which also rolled. Then I tumbled about ten feet. The worst part was the 1.5 mile walk back to the trailhead on uneven terrain.