It was gone. It was unmistakably, undeniably gone from the place it was supposed to be in. She knew that for sure. She knew exactly where it had been, and it wasn't there anymore. She couldn't see it there for one, but more importantly, most importantly, she'd passed where it was supposed to be. She'd been forced to. And in doing that, she'd seen that it wasn't there. She'd passed where it had been and she hadn't hit it, because nothing was there and it wasn't there anymore and it wasn't anywhere, it was gone.
And that could only mean one thing. It could only mean the worst possible thing. It could only mean her fears had been justified and her worries verified, it could only mean what she was dealing with was far beyond the scope of what she was prepared to deal with.
She didn't have time to consider the implications. She didn't have much time at all to do anything but focus on what she was already doing, truly, and all she could really do about it was hope the plan she had would work. But she couldn't stop the knowledge from nagging at the back of her mind, she couldn't stop her thoughts drifting towards that when she wasn't immediately focused on something else more urgent.
It was gone. It was nowhere, and it especially wasn't where it was supposed to be. Were the others gone too? Were they disappearing with time? Did the other know it had been there and that it had disappeared? Were new ones being created, would they even work the same way?
Gone. Gone the same way it had come. With no signs and no warning and a vague reason she couldn't fully understand, one she was too busy dealing with the immediate consequences to properly appreciate the ramifications of. Something she hadn't even begun to fully comprehend yet wiped away by something equally as alien. All her plans about it shattered, all her work on the matter rendered useless and she hadn't even seen it happen.
Twilight focused. She couldn't let herself get distracted by that. As terrible as the loss of knowledge was in an abstract and long term sense, she had much more immediate and concrete things to focus on at that point. It was not good that it was gone and it would give her a decent series of problems going forward, but none of it would matter if Equestria fell or if she died right there. And while focusing on understanding why it had happened right then could certainly help with her present problem, doing so would almost certainly not be a good idea when her brain power was most definitely better spent focusing on actually surviving through it moment by moment.
Her chest tensed and her wings flexed as she pushed herself upwards and sideways to avoid another oncoming wave of magic. Even simply flying through the darkened air Nightmare Moon's influence had brought was becoming difficult. It was rough on her skin and hard on her eyes, thick in her lungs, and her wings struggled to grip it properly. It was like trying to hold mercury together. It did not feel right. It parted at odd, jagged angles, messing her feathers and making it hard to steer herself properly. She grit her teeth and pushed harder. She couldn't allow herself to fall. Not right then.