When the girls noticed that Rein was able to cast a powerful barrier to stop the dungeon's will from escaping, they relaxed a bit as that meant he was not in any serious danger. So they started to guard Rein as he was still covered in this golden light which had turned him to look almost like a shining statue.
After about fifteen minutes, finally the light started to dim and Rein's face was visible once again. The girls were very surprised to see that it looked like Rein had become more handsome than before. Obviously it was easily noticeable for Stella, Tasha and Kagura who were his lovers but even Alexandria was able to notice it and she did not know Rein for long. So the changes he underwent were definitely massive.
