I have altered my perception of this since. Now I think she is not in handcuffs, but I think she is trying to appear to be in handcuffs. Her hands separate more than handcuffs allow at the moment she moves forward. You can see this happen in slightly more zoomed in footage here: https://www.youtube.com/watch?v=I_MXpiMWKtI (in the classic side of beef music video)
I have altered my perception of this since. Now I think she is not in handcuffs, but I think she is trying to appear to be in handcuffs. Her hands separate more than handcuffs allow at the moment she moves forward. You can see this happen in slightly more zoomed in footage here: https://www.youtube.com/watch?v=I_MXpiMWKtI (in the classic side of beef music video)