At the time, the group was attending ASP baton training.
https://www.asp-usa.com/pages/training-programs
Armament Systems and Procedures = ASP
Why was the pistol out of the holster?
Batons are not even as dangerous as a well-designed pointy stick: perhaps the authorities find it necessary to leverage fire power in anything more serious than defense against grapes.
As Batons are more dangerous than a banana, and there already is popular precedent for authorities to use lethal force in defense against a banana, even in training, I see no reason why we should expect significant action against the trainer.
Banana Republic.