Pretty quiet here, so I thought I would make up some scenarios.
ASA rules, no one out, no one on.
Single to LF, BR collides with F3 standing on 1B while rounding the base. BU extends arm for obstruction.
BR continues 10 feet to 2nd then heads back to 1B. Throw from LF gets by 2B and goes down right field line. BR is now standing on 1B, sees the ball go by and runs to 2B and gets thrown out on a bang bang play at 2B.
If BU had only protected BR to 1B is obstruction waved off once runner goes back to 1B and runner is now out at 2B? Or is runner placed back at 1B?
If runner never made it all the way back to 1B would they be placed back on 1B instead of out at 2B?