Protection from Physical Attack
There are hundreds of stories about ghosts who have attacked investigators and done them injury. If they are doing physical or psychic damage, it makes very little difference if these attacking entities are ghosts, demons, poltergeists, or elementals.
Tales concerning physical attack usually seem to deal with ghost hunters, as in the instance when a TAPS cameraman was knocked to the ground, or another case when Jason Hawes was bitten on the back. People who have dabbled in the supernatural are also vulnerable to attack. Casual bystanders or observers don't usually seem to elicit the same active hostility that investigators experience.
Accounts of people being physically injured by entities aren't common, but they do exist — the entity usually manifests a furious energy that blasts people off their feet, causing them to bounce off walls. Most ghosts, like most people, are not violent or angry. But some are. In most cultures around the world, ghosts are thought to have some ill intent toward the living, which they manifest either through inducing a chilling reaction or by doing some sort of physical harm.
Are shadow people demonic or likely to harm people?
No one really knows what shadow people are, and although they are truly creepy and frightening to see, they may be trying to annoy us. There aren't any reports of them trying to actually harm the people who have witnessed their eerie presence.
Indirect Damage and Harm
Just as living with the stress and fear paranormal events can induce takes a physical toll after a while, injuries can also occur reacting to an entity; a trip and fall or taking a tumble down a flight of stairs may be accidental, but the trigger was the paranormal event. Entities have been known to trip or push people. When these attacks occur, serious injury is sometimes only narrowly avoided. It seems the beings adhere to unwritten rules and limits. The exception is when they get a little help from their friends, the demons.
Enter the Demons
Researchers pretty much agree that demonic entities can cause serious harm to humans. Demonic encounters are very, very rare. Most entities encountered are human spirits who have passed over. The overwhelming majority of those spirits are benign and even benevolent. Still, if an individual is exploring high-risk areas or is involved in the practice of dark magic or experimenting with decadent and selfish lifestyles, she may attract the demonic. The best way to stop the attack of elementals and demons is not to draw their attention. If you must, conduct a ritual or procedure to protect yourself before each exposure to the risky situation. This can take many forms, including meditation, saging, amulets, prayers, or whatever is congruent to your own belief system.
Territorial Ghosts
There are, however, those rare cases where a ghost has become overly territorial and decided that it doesn't want anyone living in its place. Entities of this sort do everything in their power to attempt to drive the residents away. There are reports too numerous to list of people being struck by flying objects that were propelled through the air by unseen hands. Usually, these human entities can be coaxed and cajoled into the light, or made to stop their activities through other means, such as rituals that invite them to be at rest and which protect the residents of the house. If a protection ritual fails, then it is time to call in the big guns and ask for outside help. Sensitives often get assistance from their fellow psychics on the investigative team. Kym Black underwent psychic attack and enlisted the aid of fellow T.R.I.P.R.G. members to drive the entity away by using a ritual specially designed to break the tie between the entity and Kym, who bounced back from the oppressive presence within days.
Be respectful when visiting cemeteries to conduct an investigation. Respect the departed, take care not to step on graves or lean on headstones, and speak softly and courteously if you are attempting EVP work. This is just good manners, but it also protects investigators from the wrath of territorial ghosts.

