Yeah I've heard that, like how gravity doesn't affect him as much.
He apparently was so foolhardy he'd taunt sentry's at barracks and shrug off gunshot wounds. So possibly wearing body armour as well!
Maybe back in the 19th century alien's / EBE's just wanted to lord it up and play games before the serious stuff started in the 20th century??
The story about him shrugging off gunshot wounds, actually grew out of an incident where barracks sentries fired at him with
blanks. I came
across that story when I was looking into the similarities between SHJ and the New Jersey Devil (NJD).
My own theory on his "gravity defying" leaps, is that his oilskin "cape" was actually a set of leathery wings (like NJD).
The list of similarities between the two entities (SHJ and NJD) is incredible when you look closely at it, including;
glowing red eyes,
long (metal-like) talons,
hooves or cloven feet,
the ability to breath blue-coloured flames or "fire",
a fantastic ability to leap over high walls or onto rooftops
and Black or very Dark Wings/cloak of oily skin.
Anyway, just a theory!
cheers,
GTD