Ella watched very closely as the professor removed the crup's tail. Her eyes squinted, just in case the animal screamed, but it was like it didn't even realise. She sighed with relief and smiled. Although it didn't look too happy, just like Ella thought would happen.

Raising her hand as she observed the crup, Ella said, "Aww, he's looking for his tail. He's probably confused and maybe a bit scared." One moment his tail was there, then BAM it was gone. If Ella was a crup, she'd be quite confused herself. "He probably doesn't feel too safe, either." Especially with a crowd of witches and wizards glaring at him.

Or maybe he just felt naked. And embarrassed with everyone staring at him.