Rex laid back on his throne once more, seemingly nonchalant about the situation.
Despite the fact that Adhara and Evelyn are confronting Giana as of this moment, he doesn't seem to be concerned about it. First of all, he's quite confident that Giana wouldn't try to hurt those two, considering the damned mistake that she did.
Even if she did tries to hurt them, he will know instantly and can reach there in seconds.
Second, the fact that Giana came here in search of him obviously indicates that she wanted something. Putting that into consideration, the chance that Giana would hurt Adhara and Evelyn is extremely low.
Of course, Rex can't also deny the fact that Adhara and Evelyn might try and kills her.
But then again, knowing those two, simply killing Giana would not be satisfactory for them. In a sense following their emotions, they would definitely want to hurt her to the point of breaking her without actually killing her.