The dreaded R1 on 2B SS and runner collide

[first2third]

slap hitter at the plate outfield pulled in. Runner reaches third and that is the base she would have reached had there been no obstruction. Left arm was out with the delayed dead ball signal and obstruction was a loud verbal (in fact I left the arm out there even as everyone was leaving the field).
The runner on first touched first and then went to her dugout and the runner on third ran off the field to the first base dugout. Of course the defensive players all ran off the field almost immediately. Maybe I could of stopped everyone but the runner reached her base, so I didn't see her as protected anymore.