The Ninth Floor

And the creepier thing was that the old man did not seem to emanate any kind of aura at all. It was like he is a normal person

But the fact that he stops that fist with one finger is kind of like an obvious slap to the face to people who thought that the old man is just a normal old man

When Gabe unleashes his fist, even the bar was affected and all the glass on the counter, behind it, inside the cupboard, all of them exploded at the same time because of the pressure. 

Even the one stored inside a reinforced runic cupboard was smashed by the force

When the bartender sees this scene of the old man stopping his fist with one finger, he was shocked beyond belief

If before he treated this old man as simply just some out of towner who does not know to measure his own ability, right now, the bartender is quite sure that this old man is not an ordinary person at all.