One of the basic rules of safety is:
Never fire at game until you can properly identify your target, and what is beyond it.
Its obvious from this story that neither you or your buddy could identify anything but movement. If you can't recognize the straight lines of a 5 gallon bucket, you had no business being any more than curious. You certainly should not have been preparing to shoot at it.
You and your buddy did the right thing, in spite of yourselves.
I hate it, too, when non-hunters go wandering in the woods without wearing Blaze Orange clothing during deer season. They are breaking the law, but I can't think of the last one that was ever prosecuted for this stupidity. And really, Doesn't it sound just a little pathetic for a grown man to say he could not differentiate between a human being and a deer?
There was a man shot in Arkansas, years ago, because some hunter thought he was a " turkey " and blasted away at the sound of the turkey call the hunter was using. He blinded the victim, who went on to be the head of the State Game Department. We had a similar incident here in Illinois a decade or so ago. A Large judgment ( not large enough, of course) was taken in a civil suit against the shooter who shot a turkey hunter in the back and leg when he shot at " sound ". His defense was that he thought it was a turkey he was shooting, and he wanted the appellate court to overturn the judgment. The Justices commented on how much larger a 6 foot man is, even sitting down at the base of a tree, than a turkey, in affirming the trial court.
DON'T Shoot at movement, or at sound. Period.
Just a couple of years ago, a man shot and killed his hunting partner, with a deer slug clean through his chest, when, before daybreak, the victim, who had left the shooter to go to his treestand 50 yards away, returned to tell his buddy that someone else was in his stand, and that he was going to go someplace else. The shooter fired at sound IN THE DARK, technically, before deer season opened, and before legal shooting hours.
You get the idea that someone has to work pretty hard to injure or kill someone else negligently---- and for what?