On the fifth try, it was almost perfect. But there were 2 miscues. On the 2nd floor, Tony Jaa slams a door into the head of a stuntman and the small glass window on the door was supposed to break. It failed to do so, so they used CGI to fix this. The 2nd issue was the fight just before the sink gets thrown. The timing was off as planned but the end result looked natural so they decided this was the take to use in the final film. Simply amazing.