runner interference clarification

[CecilOne]

Rule 8-7-J-1 says runner out for interfering "with a fielder attempting to field a fair batted ball".

J-2 and J-3 are about throws. With no intervening wording about deflection or exception:
Rule 8-7-J-4 says "Intentionally with any defensive player having the opportunity to make an out with the deflected batted ball".

Ignoring the inconsistent grammar, is there a rule cite or published clarification for:
- separating deflected from any batted ball
- why J-4 requires intent
- why J-1 does not apply to all batted fair balls, regardless of deflection?