I made that assumption because currently, with all the details we've got, it's hard to compile the scene of that tragic moment in a such a way, that Nyxmay would for some reason not prevent murder from happening and at the same time snap from witnessing deaths of her subjects. I mean, they couldn't just tie her hands or something, right? And, at the same time, it can't be that she returned to the temple when it was too late, because she remembers "stop, it hurts" line, meaning that everything happened in front of her eyes. Having any conditions different from these 2 makes it even harder to imagine what the hell happened back then.