It's one of the styles of Silat. Your friend's lineage doesn't look familiar butI can tell you a bit about Silat in general.
Silat is a word that translates quite literally to "self defense". Its a style that is indigenous to the Malay Archipelago, so just about all the countries in that region have several styles of Silat. Its particularly popular in Indonesia where schoolchildren are taught Silat as a dance, then when they become of age they learn the combat applications.
It might sound strange to hear of a combat art referred to as a dance. Like many of the older arts in the area, Silat predates the invaders to the area. When foreign invaders/occupiers came to the islands, the local people blended the movement in to dances, to keep their fighting secrets hidden from the foreigners.
When the Muslims reached the archipelago, they adopted Silat in to their culture, and adopted the fighting arts in to not only systems of combat but also in to activities at the mosque...which is something that you can find even today. There are a good number of Silat stylists in the US that are either Muslim or under a Muslim teacher.
The system that I partially learned is headed up by a man (GM Edward Lebe) that was a green beret and a red beret in the Indonesian military. The battlefield applications of Silat are applications that end with the death of the attacker. It is a bladed art, but the mechanics are such that what is done with the blade can be done should the defender lose their blade and has to subdue the attackers with empty hands, often with death coming by way of a broken neck.
The style that I learned was very soft and fluid, with much more attention paid to leverage than striking.
Here is a clip of GM Lebe, the clip will show him going through his jurus (techniques) in an open courtyard, and has been edited to show GM Lebe executing the exact same move on a partner in the gym. This particular style is Harimau (Tiger), which incorporates a lot of low stances. Its....not the best for someone with a bad back
There are a few of us that train in Silat here, please don't be afraid to ask questions.
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