Running 3 feet (left or right) out of the baseline to avoid a tag only applies between bases 7.08(a).
In this play, R2 has abandoned his effort to remain a baserunner by showing he has no intent to reassert his status as a runner (isn't trying to get back to 2B). He is out. R1 is awarded home on the overthrow out of play.
Well, that's the pro interpretation according to Jaska/Roder.
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