Look back rule stoppage

[Tex]

Had this Look back play in a 14-U game this past weekend and wanted to know if the proper call was made.

The batter hits a double to right field and has just rounded second, stopped, and is looking at the pitcher. The pitcher is inside the pitching circle, holding the ball, and has raised her arm as to make a play on the runner at second base. I realized that the Lock back rule is not in effect as the pitcher has just made a play on the runner. But what happens next is where the question is.
The second base runner stops about 2 feet short from returning to second. The pitcher has also stopped inside the circle. In other words both the runner and pitcher are now motionless and starring at each other. After at least 4 seconds, I started counting to 4 seconds and called the runner out. Between innings, neither of the coaches nor the other umpire had a problem with the call. All commented that no one had seen this before.
Questions:
1) Was the call proper?
2) How long can both the base runner and pitcher remain motionless after a play on the runner?