Reddit reviews Fighting for Honor: The History of African Martial Art in the Atlantic World (Carolina Lowcountry and the Atlantic World)

A few people here have mentioned knocking and kicking so far, and also T.J. Desch Obi, who talks about it in detail in his book. As he points out, black communities in the Carolina Low Country are very insular. It appears to be difficult to even get practitioners to admit there is such an art, which would of course make it difficult for it to become well known. It is easy to see why they would be so secretive, given the pervasive systematic violence against black communities in the United States, and especially the justifying narrative of black propensity to violence.

The only scholarly work that I'm aware of (and I'm not a scholar, so there may be more) would be T.J. Desche-Obi's book here.

His book describes how in his field research he encountered old men who were able to relate an art/game they played that had similar distinct movements that he recognized as being in common with capoeira angola. However in subsequent trips those men had passed and only after some time some younger kids began repeating movements that they remembered the older men doing and using it as a draw for tourists.

Since the price on amazon seems higher than I remember I'd encourage you to look around for a better price, but from what I remember these displays don't resemble what I remember T.J. describing, but I'd have to pull the book out from storage, and that storage is in another country right now so I'll have to recommend that you either contact him at Baruch College/CUNY or see if the book is available via a library or other resource