somewhere in the middle of the video a question was asked about medial whips in TT prostheses and the instructor said that whips are only seen at the knee. you can in fact have a whip at the heel when watching in the coronal plane as the amputee is walking away from you. the gait deviation of medial whip is seen when the foot is far too externally rotated (too much toe-out angle). it would be seen at pre-swing as toe-off occurs and the individual enters into swing phase.