Points to be made:
After his explanation, I asked him who asked for time, knowing full well nobody asked for time.
An umpire can kill the play anytime they believe it is necessary. A request is not necessary.
Whhaattt!!!! A 'person' not officiating a game, came on a overruled the Umpire 'ON' the field? Sorry, training or not, that isn't right. Only person who overrules me on a field is when a protest is made for a 'RULE' violation, not a judgement, and/or a UIC makes a ruling, or GOD. This sounds entirely like a judgement issue that the BU caught the runner off the bag on the transition in which it would be a good 'judgement' call. Sounds like someone needs to be pulled from the 'training' program. Sheesh.
Got that out of your system? Good, now go back and read the post. I believe it says "THEY" called her safe.
I agree, suspending play at the end of every play is a SP mechanic and though it should apply to FP, it doesn't. Unless stated to the umpire in a different context involving this umpire's training, it was wrong to offer such direction in the FP game.
Now for the non-umpires on the umpire page. This was a friendly and these are used often in many areas to help train umpires. Often, there is a trade-off between the org/teams and the umpire association. They get umpires at a reduced or no cost in exchange for allowing additional umpire(s) on the field for training purposes which may include a break in the flow of the play for instruction and/or correction. For that matter, it is not unheard of telling a runner to stay on a base (even though she may have "officially" been out) to set-up a particular situation for the purpose of training the umpires.
In some states, the HS athletic assns require such a day for teams and umpires. I would be willing to bet a beer, not a Heineken though, that those three umpires were not all getting paid a full, if any, fee for that game.
If you go into a friendly where umpires are being trained and you want to start arguing calls, you probably should have taken the day off and went fishing.