I think this is nearly a bug in general, it´s so often, that a fight is started also i can´t see enemy for the next 3 rounds.
or e.g. at one place where the gargoylething attacks you after opening the door in the rapax level (2levels before the castle, don´t know the name of this map). some dudes stood on an bridge over my path, and the fighting engine started the fight, although neither they not i could attack each other, cause of the higher position you couldn´t aim at them
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