The runner is blameless in this situation. The first baseman should not be in between first and second (the runner's path) when attempting to cover first on the tail end of a double play. I'm assuming an attempt to force the runner at second would be the normal play in this situation.
If the first baseman were holding the runner at first, he'd already be at the bag. If not, he'd be either in front, or behind, the baseline, and angling back to first in his attempt to cover the bag.
I'd have obstruction on the defense on the play you describe.
Senior
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