[The following is not written by me]
My Theory on Slender Man
So, it's been said that the slender man is a polydimensional being (existing in 4+ dimensions, whilst we can only comprehend 3 dimensions). If you compare our three-dimensional existence to the theoretical two-dimensional being, we could theoretically have slenderman-like abilities to their observation. While we understand the three dimensions of height, width, and depth, a two-dimensional being would only understand two (let's say height and width). Imagine such a being in your room right now. From a perpendicular angle, they would look normal, but as you change your angle of view, you would realize they have no depth - they are completely flat. But how would they see you? Several parameters must be met for them to see you at all. Firstly, you must be in line with their two dimensions. You cannot be observing from the side, but must physically be in their plane of existence:
http://imgur.com/aFYGK9T
This accounts for slenderman's apparent "teleportation" abilities. If you were to walk in the z-direction (3rd dimension - depth), the two-dimensional being would observe you to have disappeared from existence until you return to the plane of x and y that they exist in. If you'd moved forward or backward before returning to the said plane, your position on the plane upon 're-entry' would be different from where you were observed to have 'disappeared' from. The two-dimensional being would have witnessed you teleport.
http://imgur.com/aFYGK9T
Another provision to being seen by the two-dimenstional being is that you as a three-dimensional being have no movement in the third dimension, as this would be (of course) unobservable to the two-dimensional being. You would have to be completely still in the depth dimension to be able to communicate with the 2D being.
Now we understand why Slenderman stands still and stares.
The idea of speaking to a two-dimensional being is ridiculous. Try talking without using any depth. Sound waves themselves travel in three dimensions, so of course you would be unable to communicate with the two-dimensional being even if you did speak the same language. But would you want to? Let's say for a second that not only was there a two-dimensional being in your room, but every other human on the planet was two-dimensional. Would you not try to communicate with them, futile though it is? Out of curiosity, or if for no other reason, out of sheer boredom. So what are the implications for our friend Slendy? As far as we can see, he is the only being with an understanding of his multiple dimensions in this world (unless we consider the possibility that every slenderman sighting is in fact a DIFFERENT slenderbeing, all with the same characteristics). You gotta feel sorry for the guy. He would constantly try to contact the beings he coexists with, however unsuccessfully.
Back to the 2D being in your room. Imagine what would happen if you tried to grasp or hold them. You would inevitably move in the z-direction, altering their z-coordinate and effectively making them unobservable to the rest of their kind, because they are no longer in the same x-y plane as the rest.
http://imgur.com/C5GpIC1
After contact with you, the original two-dimensional being, though unharmed, now exists on a parallel z-plane compared to the rest of his peers, and therefore is no longer observable to them - nor are they observable to him. Simply by changing his position in the z-axis which he cannot comprehend, you have 'abducted' him without leaving a trace. This is how slenderman (accidentally, as likely as not) abducts humans it comes into contact with.
Finally, imagine for a moment two different scenarios in which the two-dimensional being in your room has a gun and a knife, respectively. In each scenario, escape is very easy for you - you simply have to move in the z-direction in which he cannot move, and you have avoided the attack. But if you were unable to avoid the attack for whatever reason, let's examine the effects.
Scenario 1: The Gun His bullet would fly through you, creating a tall (9mm or so) but infinitely thin wound channel. Effective? I'm inclined to say no. Painful? Probably not (the wound channel is so thin it practically does not exist). Deadly? Definitely not.
Scenario 2: The Knife A stab wound would produce an effect similar to a bullet wound - a tall but infinitely thin wound channel. So we can rule out the effectiveness of stabbing. A slashing wound, on the other hand, has the potential to be deadly. A very tall (but still infinitely thin) wound would result. If tall enough, this could bisect your head, another vital area, or even your entire body completely, killing you.
Let's recap: Slenderman, as a polydimensional being, can avoid any of our attacks by moving in his 4th, 5th, or Xth dimension. We would simply observe him disappearing before our attacks landed. If, however, we landed an attack, a gunshot or knife stab is harmless. A slash with a knife (or ideally larger bladed weapon - a sword or machete), could be very deadly to Slendy if and only if it completely cut a vital part of him in half.
So, here we are. Slenderman's powers and some motives explained. Something I left out completely, however, is the topic of malevolence. This is simply because we do not know enough to judge. Most assume that because the effects of an encounter with slenderman are fairly negative, the being itself must be a malevolent entity. As I explained, however, the negative effects of a slenderman encounter are quite possibly accidental and no indication of slenderman's intentions. We have no proof that slenderman is truly malevolent or wishes to harm humans. My personal opinion is that he simply wishes to communicate with us but is unable to do so yet.
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-Creepypasta Research-
ParanormalDon't look at it. If you do, forget it. Don't look for it. If you do, you'll regret it. Forget.