[Tru_in_Blu]

I’ll throw out a couple of thoughts first.

Umpire INT is not an immediate DB. It’s a delayed DB.
In INT committed by an offensive player or coach, we would have an immediate DB and SOMEbody would be ruled out.
Calling the BR out as a result of UMP/INT is not correct.
A moot point, but following your logic, there were 2 outs, you called batter out, pointless to put the other runner back on first.

USA Rule 8.6.F describes UMP/INT when there is an attempted steal or pickoff.

Technically, was there a steal attempt or pickoff here? Probably not “technically”.

Posited scenario: With 2 outs, bases loaded, we have an uncaught 3rd strike. Catcher could just pick up the ball and step on the plate for a force play to end the inning. But if the ball rolled up the third base line a bit and F2 picked it up to try to throw to F5 for a force there and we had UMP/INT? Does it qualify as UMP/INT?

I’ll await the ruling of the protest committee on that.

Good case play.