There were many mistake that day.
Andi am certainly not going to say the SO is without blame.
However this piece of legal tripe will have come through the District/County Attorneys office, not the SO straight away.
Note also the Grand Jury didn’t find the SO accountable, so there’s more to the story than we are getting here.
Having been trained in the use of stun grenades, I have always been highly critical of their use, first because they’re grenades and indescriminate in their ‘injury’, as well as the secondary risks.
They have a place, but its highly limited at best.