Development of the opening from our feedback, a full break down of the idea

. The scene opens showing a man strapped up to a chair, with tattered clothes, looks dirty, blood dripping, bruised on the face. The man slowly raises his head and becomes conscious, and looks around at his surroundings, where he can see a blinking light of a security camera watching him. we see him tied up by the hands where on his left hand you can see a circle symbol embedded to his hand. (Not a tattoo like below but a scar)

. After coming aware of his surroundings, he struggles to escape his restraints with high intense breathing, failing to do so he tries to scream through the gag in his mouth. He starts to hear the front of the container start to hear rattling of a chain to unlock and open, making the man scream again, for help.

. The screaming dies out, when this mysterious man enters in a full black suit with a neon purge looking mask on his face, without saying anything he walks up to the man in the chair and proceeds to put on a pair of gold knuckle dusters, while you see the man in the chair frantically shaking his head and almost crying.

. The mysterious man proceeds to beat the man in the chair up with splatters of blood coming off at all angles, after beating him up he walks away where you can see the man is clearly knocked out cold again, taking out a hancacheff you can also see the same symbol on this hand as you did on the man in the chair, where it can cut to black.

Another potential ending is after he shows his hand there could be a shot by his feet with the mask falling and hitting the floor then it cuts to black which personally i think may look nice.