Has anyone tried this before?

I fished for LMB and Stripers last week in California with a guide. He grabbed the rod (7'-11" Sage LMB rod) and started this underhand cast stuff with a big deer hair frog. It worked amazingly well for laying down the big LMB flies softly. He could flip it under branches, docks, etc. I tried it with some success. It seems like it would be tricky if you weren't casting from a boat. This cast breaks all of the traditional casting rules (a lot of wrist action) but it works well.