TCB1
Interference calls by umpires judgment are at times difficult at best. Why?
1) The umpire must understand the definition.
2) Understanding the rule definition can be misinterpreted. [The definition as stated in Rule 2.00 is: "(a) Offensive interference is an act by the team at bat which interferes with, obstructs, impedes, hinders or confuses........
(thus leaves a rather wide latitude)
3) Offensive Interference must be recognized by umpire immediately.
4) Should Offensive Interference be called, the proper penalty should be applied.
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I did not read nor did you state the umpire called interference.
If no interference was called (or was lifted), the batter-baserunner is declared out! (since SS fielded ball, made the out at 1b), had no intent of making a play on R3 or R1, and their is interference, if called, is lifted, since in umpires judgement, SS was NOT "obstructed, impeded, hindered or confused".
If umpire judged R2 for offensive interference, and umpire judged SS was "obstructed, impeded, hindered or confused" and was making a play on R3 (or R2), then a proper penalty is R2 out, batter-baserunner may be decared out and if zero outs at start of play, R3 does not score and returns to 3b.
The more common occurance for offensive interference and at amateur play is typically when R1 advancing to 2b and attempts to "break up potential double play and overslides 2b, pops up slides, rolls and interferes. Thus R1 is declared "obstructed, impeded, hindered or confused", ball is dead, R1 is declared out, AND batter-baseruuner declared out. R2 and R3 return return to the last base that was, in the judgment of the umpire, legally touched at the time of the offensive interference.
As far as your assistant's interpretation, he may be applying the penalty for offensive interference when R1/R2/R3 getting hit by ball off bat (typically from ground ball), thus in umpire's judgement, the offense interfered, and runner is declared out, ball is dead, and batter-baserunner awarded 1b, and credited with time at bat.
Regards
Bear