There clearly can (and often is) interference without contact. and, a runner who "jostels" in front of a ground ball is often a good example of this.

Do you have a rule # by chance? I havn't seen a runner called out for pausing in the path of the ball in order to throw off the fielder. That's what I meant when I said "jostle. And from what I remember reading in OBR, there is no interference without contact. Like I said, I have never seen interference called on a runner (or batter) without contact being made.

OBR 7.08b

(b) He intentionally interferes with a thrown ball; or hinders a fielder attempting to make a play on a batted ball;
Rule 7.08(b) Comment: A runner who is adjudged to have hindered a fielder who is attempting to make a play on a batted ball is out whether it was intentional or not.

Nothing here says it has to have contact. And I have seen Interference called hundreds of times without contact being made. Whether OBR, NCAA or NFHS.

OBR 2.0 Interference
(a) Offensive interference is an act by the team at bat which interferes with, obstructs, impedes, hinders or confuses any fielder attempting to make a play. If the umpire declares the batter, batter-runner, or a runner out for interference, all other runners shall return to the last base that was, in the judgment of the umpire, legally touched at the time of the interference, unless otherwise provided by these rules.

Even as a Cardinals fan, I'd have to say this is clear-cut interference.

Contact makes the call much easier, but it's not necessary. I think this play is INT!