Manual:DIL Manual/opponent()

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integer opponent(u1 : unitptr, u2 : unitptr)
   u1, u2: Two characters
   return: TRUE if u1 is in combat with u2, FALSE otherwise.
   Example: if (opponent(self, victim)) ...
   When in a combat, you are usually only melee-attacking one opponent,
   although you may have many other opponents. This function lets you
   check if you are directly / indirectly an opponent to another unit.