If anything, I would never want to be the partner with this master. You may feel bad for the guy being beat up like a punching bag but he’s actually his oldest, most experienced disciple and has a very high-level of Qi. Once your channels are clear, physical contacts don’t hurt you much anymore.
Now regarding the martial arts in this video, this style seems to focus on explosive, fast Qi force to attack pressure points of the opponents and to finish them quickly. It has characteristics of Wing chun, Chi Na, Bagua stepping and five animals style.
Back in the day when Chinese monks and other kung fu masters fled to south because the king’s army was after them, turns out it wasn’t south of china but they went deep further into Vietnam. That’s also explains how this original style of wing chun flourishes.