When does a BR stop being a BR? The definition says that happens when they are put out or reach 1B.
If truly is at the time of reaching first base, then
no one can legally overrun 1B, as passing it would mean you reached the base and are no longer a BR! I think this definition requires some subtlety in interpretation.
However, 8-8-I requires the BR to touch it. That isn't the case here so it isn't applicable on the "first" overrun. The "first" overrun isn't a legal overrun, and thus never happened. We
cannot assume the runner touches the base when he passes it in this case. RS #1-L (Appeals) explains why: We assume the BR to have touched 1B when he passes it
before the ball arrives for the purposes of the judgment call on the "force" out. (
I know this is not technically a force, but work with me). That is not the case. The ball beat the runner, but the throw was errant. For the purposes of the missed base, I don't think this is any different than any other missed base that happens right in front of us, which means a proper live-ball appeal needs to happen.
I think the relevant softball rules (speaking ASA) are 8-7-A, -G, -H, and -I, plus 8-8-I.
The runner is out when:
A: A runner runs more than three feet from their base path to avoid a tag.
No, not out. (Interesting side note, if a B/R is not a runner, can the B/R legally deviate 3+ feet to avoid a tag? Common sense says no, but good luck finding a rule.)
G: A runner fails to touch a base (yes) and the ball is returned to the infield and properly appealed (no, not from what I see in the video).
No, not out.
H: A batter-runner legally overruns first base (defined in 8-8-1 as touching, so no as RS #1 tells us when to assume the BR "touched" on passing), attempts to run to second base (no), and is legally touched with the ball while off the base.
No, not out.
I: When running or sliding for any base and the runner fails to touch it, provided the defense properly appeals. I didn't see a proper appeal, just a tag attempt.
No, not out.
So he's not out before he finally touches the base. What about after? Well, the applicable rule is already listed above, 8-7-H. The runner, after touching the base and overrunning, did not attempt to advance to second before he was legally tagged. The former batter-runner is not out.