I checked Bob's math and he was very close. A 68 MPH throw would travel 10 feet in 0.1 second. That darn sure sounds like imminent, as far as the catcher blocking the plate while receiving a throw that is imminent. As for the original questions, repeated below.
a) catcher moves up 3rd base line to catch ball while runner approaches home. Ball is approx 10 feet from catcher when contact occurs. Catcher is moving toward ball at the time of impact.
b) same situation but in this case catcher is not moving at time of impact (standing in the baseline) but is up the third base line approx 4-5 feet from home
In a, the catcher is 10 feet up the line to catch the ball. Unless the runner makes some kind of move that looks intentional then I have a train wreck, and no call.
In b, the the only difference from a is that he has already arrived at the spot he needs to be in to catch the ball (ie not moving). If the situation is really the same, ie he is up the line to catch the ball, and it is 10 feet from him, then I have the same train wreck, and the same no call.
This dicussion is about plays at the plate and would not apply to runners who run into fielders who have a chance at fielding a ball. A SS could be set to field a ground ball that could be 30 feet away and if he is bumped by a runner I have interference.
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