Bob did a good job with trying to actually answer the question.
The catcher or any fielder for that matter, must be in the action of attempting an imminent catch. A lot of us read this rule to be that the ball must be on the way...that's the safest course. But how far up the line or away from the base do we let him go? Many of us were taught that a step up the third baseline puts you on the outer edge of the box. I let them get there, since any further and the kid isn't throwing directly to the base for the play. How long can he camp out? It is always the runners responsibility to avoid the contact, especially with mulitple runners scoring ahead of the play at the dish. If he obstructs either of those guys, it will be obvious. But the bigger question is on a throw from center or right, we don't let him camp up the line beyond the box - again, the throw is to the base, not up the line! The runner has three feet on either side of the line to go around him, but this guy has just narrowed the angle of attack. If you set up third base extended, you should have a great angle for obstruction, out of the baseline, malicious contact and safe/out. Good luck!
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