This skill is legal for high school and below. In a braced flip, there can be a bracer on the foot as long as there is still at least one hand-arm connection with a bracer. In addition, the foot bracer in this video has an additional spot on the double based prep. That spotter is not required. The bracer on the foot can be in a double based prep with no spot, a single base shoulder stand with a spot, a double based thigh stand, or a shoulder straddle without a spot.