The Thalmor's defiant, insane smile suddenly wore off as he took an arrow straight to the arm. He flinched, dropping the dagger before he could kill the girl. She was quick to run out of the way the moment his grip released, and for some reason, looted something from the other hooded Thalmor as fast as she could.

The Altmer bobbed away from Serena's punch and immediately went after the girl, ignoring the fact that he might be killed at any second now. He went to grab her to use her as a shield yet again, but... there was no physical entity anymore. He kept trying to grab hold of her collar after she became a transparent blue. It was plastered all over his face now - he knew he was doomed now. The Miko slowly turned to face him, revealing an amulet glowing brightly in her ethereal form. She shook her head apologetically, shutting her eyes as she didn't want to watch him die.

...Being in this form would prevent Yuki being splashed with the Thalmor's blood, also!