RSL commentator, commenting that he thinks Gashi is a poor choice for a sub, that Gashi isn't the type of player to "put in a shift", rather he's the type of player with a cigarette and a glass of vino....
Until the next stoppage. Once there's a stoppage and a restart nothing before the restart can be reviewed.
Because there's little gained and a lot lost if the review determines that there was no missed call. Better to wait for a natural stoppage when you aren't taking away a possible attack.
He could, by blowing the penalty when it happened. In this case, he didn't see it or didn't think it was deliberate - so the VAR called down and said "Hey, we're looking at this" at the stoppage and then they indicated that deliberate handling took place and the PK was called.
I mean in a VAR situation. It would see weird if they went down the other way and something happened like a goal or foul in a good spot for a direct free kick, and then they go to VAR, do the PK, etc.