I didn't like the blurs. To me it felt like they made your video "unclean", not in the sense the quality looked bad or anything but because it doesn't blend well with the rest of the video's style which was clean and sophisticated. The cuts were sharp, the integrated masks melded with the footage and worked excellent as transitions, the pacing was fast and intense and those black borders were a really cool addition but the blurs just didn't quite fit. I know they were for the sync but I think you could have tried something else for the sync in that area, like choosing some other scenes for internal sync as an example might have made it looked better.
Maybe it's just a personal thing I dunno. As an action entry though, it's fantastic. There's no point to it, or at least I couldn't see a theme but it's got that hype feeling that action videos give off which I like. Nice work! Good luck in the contest!