obstruction and trail runner

[O.T.Hill]

Solve this scenario for me, please. I came up with this one off the top of my head as I sit in the middle of swampy conditions with my first game scheduled for a week from now:
B2 hits a single to left-center. R1 is obstructed by F6 as he rounds second and is subsequently thrown out at third. B2 is then thrown out trying to go to second. I know that R1 may be awarded 3rd, and even home. But, what about B2 ? Is he out for trying to advance past first, which he probably would have placed at? I have read about the lead runner being awarded one base if he was stealing on the pitch, or being placed back where he was at time-of-pitch if he was stationary. I don't recall reading a whole lot about the trail runner.