When I first turned toward skepticism, I had a few experiences that I had considered possible mystical experiences for many years. Many of these experiences had fairly easy natural explanations when I went back and revisited them with a more skeptical mindset.
But I did have one experience that was maybe a bit similar to yours.
I was with two friends, one of who is now my husband, and the other his mother, and we were about to take a formal ghost tour at the supposedly haunted hotel we'd been staying at for a week. We were waiting for the tour guide to show up and my friends and I were standing with our backs just next to a wall, at some point leaning against the wall, at others just standing there, when suddenly I felt a sensation as if something kicked or punched me in the middle of my low back. It hit so hard that I sort of stumbled forward. My would-be husband said I turned white as a sheet.
There was no one else around. It wasn't a prank as they aren't the pranking kind, and of course I am married to one of them and the other is now my mother-in-law so I know them well. My mother-in-law to this day believes it was the ghost. And anyway it didn't feel like a physical sensation the way a fist or actual foot would have felt. I didn't feel contact with my skin, more an explosion type feeling.
Five years later I was diagnosed with temporal lobe epilepsy. One of my more common sleep-onset hallucinations is a tingling sensation in my low back in exactly that same area.
If you know anything about temporal lobe phenomena, you know they can involve all sorts of strange sensations, from the tingling I experienced to voices, to the sensation of a presence in the room, the feeling of deja vu, the sensation of leaving one's body, even the apparent sighting of ghost. It is tied up with religious and spiritual experience, and I wonder if being in a meditative state, in your case a prayerful/meditative state, might make it more likely to occur.
Since then I have read of research done by Michael Persinger in Canada. who believes that all of us experience temporal lobe phenomena, but that we vary widely in the amount we experience, from people who experience it rarely, a half-dozen times or less in a lifetime, say, to people who experience it often, such as someone with temporal lobe seizures who might experience it daily, with a whole range of personal variation in between.
So I would tend to think that your jacket tug and my ghost kick may have been that kind of phenomenon. It was my first thought when I read your story. It may be that you will never have an experience like that triggered again, unlike me, whose brain is prone to them.
Anyway, just a thought.