Grey didn't interfere with their battle, and the young man from the town easily beat the trio up before dragging them to a particular building in the town. This building looked inauspicious and was quite ordinary-looking.
Grey followed them, hidden in the shadows, he wanted to see what was happening there.
With his strength, it was impossible for this young man to notice that he was following him, with Void in tow, he was able to sense if there was anyone who was inside the building.
'Huh?' Grey looked at the building a little surprised.
'What's wrong?' Void asked when he saw Grey's facial expression.
'There's an array here, a really powerful array.' Grey said to Void.
With his knowledge of things, he was able to quickly sense the array, luckily, he sensed it before stepping into the building, if not, he would've been sensed after entering the building.