To get an entry into the City, a person needed to show their hands so the guards could check that they didn't have the Mark is Darkness.
Unfortunately, Gabriel's left hand actually had a mark of Darkness which was right next to the Mark of Light. He knew that if he showed his hands, it was only going to create trouble for him.
"I can't enter through the main entrance..."
He turned around after making sure that there was no way to get an entry through the main entrance without being checked. One thing was for good though. The City didn't have any Barrier like the Lumen City which marked the souls of the Dark Mages once they entered.
Now that he also had the Element of Darkness, that thing could've immediately disclosed his identity.
****
"Hah, little girl, there's no benefit in screaming. No one is going to save you. In these parts of the City, even the Knights don't enter!"
