[undertow]

I guess it takes some considerable imagination to create possibility ratings for impossible or unprecedented events.

If something like a hypothetical transparent force field invoked by thought, words or gestures, that can stop bullets, blades and fire in mid-air isn't actually known to be possible and might warp reality, would it warp reality more than time travel, which might be possible on paper, in certain ways, although not readily understood?

[WalterSear]

Well, fwiw, the game's mileu is historical fiction, so the system isn't intended to deal with high fantasy magical effects - just a little nudge of reality, here and there.