What appears obvious from the video is the senior onscene officer's inability to discern that subject was struggling to find his balance while complying with the confusing commands. To those speculating as to why he would have been asked to cross his ankles, this is standard arrest protocol in a high-risk scenario. If a subject is lying prone or kneeling with their ankles crossed, the un-crossing of ankles requires an additional movement prior to any effort to escape or physically confront arresting officers. This provides officers more reaction time.
But asking a subject to crawl forward with crossed ankles is not a standard safe arrest practice or protocol. The most forward operator does not typically deliver commands, as his specific role is to focus on the door down the hallway from which the subjects had just exited. Shaver could have been asked to lie prone and await cuffing from advancing officers, while this "hallway monitor" remains trained on the door ahead. Then, the advance man (Brailsford) could hurriedly move forward past a prone Shaver (with interlaced fingers behind his head) and then a "cuffing team" could immediately move forward in trace, and effect the handcuffing of the subject.
