Hm, goosebumps All over your skin and the feeling of being "prey" to something?
this territory is moderated
But how does one sense them? Subconscious part of your brain scanning the periphery of your vision for faces and shapes? Electromagnetism? Paranoia?
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It's no secret that people can sense when they're being watched [by other people], the same senses will catch up on the above as well, I think.
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Begging the question.
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