out of base line

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First i want to thank everyone for all the replies, it helps when you are new starting our. to get answers to questions that can be interpreted several ways.
Here is my next question that happened last night.
ball being thrown from outfield for a play at the plate. catcher catches it about 3 or 4 feet up the baseline tword 3rd. What is the limit of the runner going around his tag from catcher. how far can the runner go to avoid the tag at home and than come back once he passes catcher to touch home...Is there a out of baseline at the plate....how far can a runner go to avoid a tag and than touch the plate...