BR interferes with play at home

[youngump]

Originally Posted by josephrt1

The way I read your situation is different than the original post. In the OP there is the appearance of a play about to occur at the plate. In that case there are rules and rule supplements covering that situation that call for at least 1 out. In the situation you propose, if there is not an apparent play at the plate, I would agree with your obstruction call.

Completely inverse play: A couple of years ago there was a case study, maybe presented at ASA clinic; Catcher retrieved a dropped 3rd strike and was standing on the plate in act of throwing to 1st base when runner from 3rd slides into catcher and knocks her down. The instruction was this was interference with a fielder in possession of the ball in the act of throwing. Runner sliding in is out.

For MTD's play, the catcher didn't have the ball, so it doesn't matter if she was about to get it. (That's not an opinion on the rules just your response.)
For your inverse play, the clinic got it wrong. If the catcher was on the plate and slid into this is interference by a runner who has scored. She can't be out. It's got to be the lead runner who is out here.