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I've got reply from Knut Rognes:

I have never heard or read about such a behaviour on the part of a Bengalia species, although it is definitely a Bengalia.
It has always been assumed that Bengalia species –with its often spiny fore legs and strong proboscis might hunt for termites. Perhaps this behaviour of hunting newly emerged / swarming / termites is normal, but only very rarely observed. Perhaps because the swarming of the termites is rare.

I'll send specimens to Dr. Rognes for identification