Please pull up any lines you wish from Re:Zero web novel and give it a go. If you don't know where to start, you can also just use the two passages below for ease. 

Those fanatics — although he had yet to know whether or not that phrase should be plural, at least the Archbishop of Wrath was present. He had no clue as to whether or not she was working with any other cultists.

However, in a city where the Witch Cult was active, the notion of leaving Emilia alone with no one to protect her left lingering anxiety in Subaru.

Leaving someone important in a place beyond his reach was far too dangerous.

Someone beyond sight, the Witch Cult’s devilish hands would reach or those important people will reach out to the key terrorist.

Deep in his heart, turbid fear plagued Subaru.

And, taking Emilia to Wrath? That was out of the question. Having Emilia encounter the Witch Cult would undoubtedly lead to tragedy. Only that was certain.

Just recalling Petelgeuse made that clear. Subaru couldn’t let Emilia near the Witch Cult. That wasn’t a matter of why. 

His heartbeat began to accelerate, his chest thudding as he ascended the steps. Fortunately, the stairs were stone. With care, he could silence his steps, especially since the enemy’s attention should be focused elsewhere.

Subaru prepared to call for Beatrice at a moment’s notice as he slowly climbed the stairs. The tension escalated as the sound coming from above grew louder and closer.

Although the tower itself is high enough that Subaru needed to crane his head to see the top, there wasn’t anything particularly notable on the journey up. A large pillar sat in the center of the tower, and the spiral staircase encircled it.

The voice of a demon and hero came from the end of those stairs. Only one single window faced the outside of the tower, presumably to give people access to adjust and check the engraved carvings on the magical stones. The sound came from the space before that window.