I am inclined towards this situation turning out to be a werewolf type character as has been witnessed elsewhere. BUT the stealth of the bloke seems to add creedance to the Tom Brown pupil theory.
JDs account of the walking on all fours intrigued me. I see two possibilities - as the only tracks JD observed walking on all fours where when he crossed the stream. This would suggest the TB pupil keeping low to the earth so as not to silhouette against the sky in an area of less dense vegetation. But the walking on the balls of his feet all the rest of the time and the scratching on the tent suggests the werewolf character. Either way I feel this situation deserves a friend with NV to act as stag as I do fear that as he grows more confident that his activities will escalate.
Can you imagine the Tendonitis he'll suffer from, exarcerbated by damp and cold conditions?
Walking upright like that is bad enough for Stiletto wearers (no not THAT Stiletto, I mean't the shoes...)
Walking on all fours? The sunburn on his but-tocks given the hot weather lately must be a right pain the arrse.
Surely a TB afficianado has more to do with his time...