In an interesting entry in Van Zonneveld ("Traditional Weapons of the Indonesian Archipelago, Leiden, 2001) a weapon similar to these is shown as a 'lawa ayam' and used in Sumatra and Java (p.82).
It is noted here that these were used in a stabbing upward fashion, and causing atrocious injuries, suggesting that a ripping type movement was implemented with the extremely curved blade.
Not a pleasant thought, but thought this might respond to the possible manner of use.
Best regards,
Jim
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