Never having heard of the participle as a part of speech, I looked in the references I have at hand in my office, and my ignorance was confirmed. Jespersen and Curme, for English, and a variety of nineteenth and early twentieth century sources for Greek and Latin make no reference to the participle as a part of speech. Okay, Alexis, I've bitten. The looser rarely concedes explicitly, but stops replying, and retreats to the seat laughing, while the winner takes the regueifa or bread loaf as a trophy. But if this invitation fails as no one deems it worth to try to save a hard battle, the regueifa is also lost.
History tends to run against fun.
The irony is, now that we enjoy the necessary technology to indeed record and study this stuff thoroughly, the regueifa is very seldom practiced in traditional weddings in Galiza. Now, I imagine, they sing karaoke.