There wasn't much that could interrupt Miku's singing, but in this instance, the voice of a family member was one of the few. As soon as she heard that familiar voice, though it was faint, Miku paused in her singing, tearful eyes widening as her internal processors worked their magic and recognized the source.

It was then that she balled her hands into fists and placed both of them on one of the sides of the sarcophagus, softly at first.

"HakuHaku ...?"

It was quiet, at first. But then she started banging her fists on the side of the sarcophagus, tears spilling from her eyes once again as she tried to make sure Haku could hear her.

"HAKUHAKU!"

If it hadn't been obvious that she was scared before, it was becoming pretty obvous now.