Thundering saw the skeleton emerge, of course, but for whatever reason, it didn't immediately dawn on her. Didn't hit her as fast as it should have.

Because one moment, she was staring off into the trees, and then in the next, the cursed thing stepped out from the dimness past the treeline and almost locked eyes with her.

Had it been a person, she doubted she would have noticed, but from this distance, she could clearly see the two black holes in the skull as it peered directly at her. She was stunned for a few moments, never having seen this specific thing before in her time as a guard.

She wasn't completely frozen, however, and she managed to start walking towards the alarm bell on the wall, more an instinctual reaction her training had given her than a conscious decision. Then, the skeleton raised its weapon, and suddenly, she was back. 

It was a threat.

She made it to her section's alarm and rang the bell just as the skeleton started to bang on the tree with its weapon. She gave it a few more rings, just to be sure [i]everyone[/i] heard it, and then returned to the wall's battlements, crouching down to access a long crate set against the wall's interior. 

By the time she'd clutched one of the crossbows stored inside, loaded it, and looked back up, the skeletons were running from the trees and towards the wall. Cloud tried to ignore the chaos around her as her compatriots responded, instead taking aim for the lead skeleton. She didn't fire immediately, taking a moment to steady herself and brace the crossbow on the wall before loosing a bolt at her target.

Whatever the result of her attack, she did not stick around to look, instead crouching back down to grab another bolt from the ammo reserves.