Ok my analogy doesn't fit and is a poor analogy, however, it is undeniable Sam was wasting his bullets after he saw Richard get up since Richard could see the glass is strong enough to stop bullets so he had no fear of getting up and running out of the Courthouse which is why it was an exercise in futility for Sam to continue to shoot bullets since he knows the glass would not be greatly damaged, the bullets wouldn't kill the fugitive he understood to be guilty since again he's shooting freakin thick glass, and a person seriously said it was worth a shot to kick the glass door when no it really wasn't because bullets can't damage the freakin door so a human kicking hard is even more futile mainly because a metal bullet can create more damage than a human kicking using common shoes.
While Sam is a smart man he is a man that set himself up for criticism with the whole the big dog is never wrong which was proven to be an irrefutable flaw becuase he was proven wrong in that same scene so the whole he's never wrong is hugely wrong, and he refused to see the futility of a situation of wasting his bullets after seeing Richard had no fear of running out of a courtroom after seeing the glass is unmistakenly strong enough to stop bullets no matter how many damn times bullets got shot at the door.
Those are all reasons why Sam can be foolish refusing to accept something is futile because again he could unmistakably see the glass is strong enough that the bullets from his common handgun would not get through the very thick door so continuing to shoot a not fearful Richaard running out of the courthouse was an exercise in futility.