[SanDiegoSteve]

Originally Posted by Dave Reed

Mind explicitly listing which part of J/R considers this "offensive interference"?

I believe he was referring to this section of J/R:

Chapter 13: Offensive Interference

B. Thrown Ball

It is interference by a runner on a thrown ball only if such runner:
1. commits an intentional action to interfere that disregards his try to get to a base safely, and
2. such action hinders a fielder trying to throw or trying to tag.

NOTE: Interference on a thrown ball does not require contact. Note also that a runner is not exempt from interfering because he has touched or passed home. Such runner can still interfere and cause the out of another runner.

A runner must prove by his actions and the way he positions himself that his intent is to reach and stay on a base safely. Actions that disregard this intent, and show, rather, an intent to interfere include:
a. grabbing, tackling, or assaulting a fielder,
b. intentionally standing and blocking a fielder,
c. waving arms,
d. slapping a fielder's glove or mitt,
e. going beyond (over-running) second or third base in a try to hinder a fielder,
f. sliding more than a body's length from a base in a try to hinder a fielder,

e.g. R1, one out. The second baseman fields a grounder and tosses to second where the shortstop tags the bag and is about to throw to first when R1: grabs his shirt, or slides into him two body lengths away from second, or goes beyond the back edge of second and roll blocks him, or waves his arms but does not contact ball or fielder.

In each case, the runner has shown by his actions and positioning that his intent is not to reach and stay on second safely, but to interfere with the shortstop's try to throw.

Sounds like the runner in the OP was interferring with F2 trying to tag him. The runner was not trying to advance to home plate and his sole intent was to crash the catcher, who was in the process of fielding the throw. JMO.