[Shmuelg]

I'm confused. What rules are you using here? We use ISF rules.

"1. It cannot be a foul ball if the 3rd baseman is clearly standing in fair
territory and touches the ball when over foul ground."

No, the fair-foul goes according to the ball, not the player. If the ball is in fair or foul "airspace", that's what determines the call.

ISF Rule 1 Sec. 29. FAIR BALL.
A fair ball is a legally batted ball which
a. Settles or is touched on or over fair territory between home and first base or between home and third base. . . .

"2. It is interference when a runner has to dodge the bat left lying on the
ground. . . . "

Interference results in an out. I believe he wanted "obstruction". But obstruction is a violation of the defense. How can the defense be charged with obstruction when it was the offense that put the bat there in the first place?

"3. If while trying to run to 1st after D3K runner falls, gets up and heads
towards 1B well out of running lane to fair side. Catcher got the ball back
on bounce, [backstop only 8' from home plate], Attempting to throw the
BR out, hits her about five feet from 1B, single base. Interference cannot
be called because the run fell. [This play got very heated., I don't know
why.]"

Too bad there was only one base, but the play was made from foul territory. In this case, had there been a safety base, the rights to the bases are reversed. And what does the runner falling have to do with anything?

ISA Rule 2, Sec.h:
h. BASES
. . .
NOTE: THE FOLLOWING RULES APPLY TO THE DOUBLE BASE:
. . .
EXCEPTION: On any live ball play made from first base foul territory, the batter-runner and the
defensive player may use either base. When the defensive player uses the foul portion of the double
base, the batter-runner can run in fair territory and if hit by a throw from the foul side of first base, it
would not be interference.