Only if you felt he left the baseline to avoid the tag.
If SS had already gained possesion and R2 then ran more than 3 feet out of his current line, you we're right.
But as I visualize your post, R2 was simply avoiding a defender fielding a batted ball, which he is required to do.
Once the defender has the ball and has a tag attempt, then you establish the baseline.
Ex: same play, R2 cut's into the infield grass to avoid the SS who's camped out on a direct line between 2B-3B awaiting the GB. Cleary no need for R2 to go that far, but certainly nothing illegal about it.
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SLAS
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