By my research have I found out something interesting about the Tall Man. Everyone have a aura and Slenderman have one too. His aura have maybe a use for him. His aura radiation fear and frightening and at the same comfort and trust (mostly to lock kids to him). Can the Tall Man his aura appearance change? We human can change our aura appearance through feelings and our personality. How he change his aura is unknown. I don't think he do it the same way as we.
I have a theory that the Tall Man aura attack others to become the energy from them. Slenderman have a energy sucking aura.
(I mentioned the theory already in the video but here I explain it better)
But the Tall Man have a problem to become the energy from a mental healthy person. The aura Is a kind of protection. He can't go through it and he only can suck a little energy away from the aura. The chakra points need he. He need a spot to go through the aura layers to suck the full energy from the chakra points. Such spots have persons who don't have a good mental health. The auras from such person show broken spots. He could take easily the energy away from them. By a mental healthy people must he make a spot in the aura layers first. But how could he do that? Well through the fear that he bring and his mind breaking power could he make the person mentally sick and/or with his Slender Sickness psychically sick. The aura is weakened and show broken spots in it. It's his chance to take the energy. Everytime he is near can he suck the energy even the person is mentally healthy. That have side effects for humans. That is maybe the reason for the Slender Sickness.
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Here is a little sketch how it works with a mental unstable person aura.
I think why Slenderman victims are mostly kids is because they have more energy. -------------------------------------------------------------- Theory created by me
