Three years ago I was the BU when the almost same play happened to me.
1st & 2nd loaded, batter hit IF along 1st base line. Both batters tag as F1 and F3 start for the ball.
F3 yells "I got it". runner on 1st runs into F3 as F3 settles under the ball in the base path between 1st and 2nd.
I yell "Time, that's interference!". I ruled the runner out and the batter out. The offensive coach comes out to argue.
I said "coach, the runner off 1st is out for the interference and the batter is out because of a possible double play.
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Charles Johnson Jr
NFHS Class #1 softball/baseball
ASA/USSSA
Dayton, Ohio
I have been umpiring so long that it was called Rounders when I started.