Scenario 1:
two players are at the end of their duel. a player flips over Ring of Destruction targetting a monster during a player's draw phase of which they just drew their card.
the turn player comments that there's really nothing and that it looks like he's lost.
another individual passes, looks at the turn player's hand, and sees a Book of Moon in it (the card that was just drawn) and comments, "heck, just Moon it", then continues to walk past.
the turn player looks down, sees the Moon, and states that they are going to chain the Moon to the Ring.
the opponent calls for the judge and asks for assistance.
Minus the "crosstalk", this scenario happens all the time with players. Call it, "The Heart of the Cards" Syndrome. Player A hopes against hope Player B doesnt play anything good, then BAMM, "
Ring of Destruction". Player A then losses control of all
Reasoning and throws in the towel without even taking the opportunity to look at his hand or any magic or traps on the field.
As a casual observer, you have seen Player A glance several times at his face-down
Solemn Judgment, or his set
Call of the Haunted (with
Jinzo in the Graveyard), and even that
Compulsory Evacuation Device. Player A was just not focused on using the cards for defense and got rattled when Player B seemed to pull out the win.
As tempted as you may be to give a hint or two, it is totally wrong to interfere with a Duel/Match between 2 opposing players in a Tournament. I'm sure that the walker-by may not have intentionally meant to blurt out Player A's hand, and as such, give him a much needed slap in the face that the game wasnt over, but this isnt a question of Player B noticing that Player A drew a card from his deck while
Solemn Wishes was active and forgot to add 500 life points.
The contents of each players hand is not public knowledge unless a card effect renders them so. To reveal game strategy to an active player during a duel SHOULD result in a Warning Penalty for that player who gained the advantage, even though its hard to say if when he calmed down, he may not have done exactly what took place anyway. And the individual who "blurted out" the info, if he was entered into the Tournament, he should be DQ'd as he showed poor sportsmanship (cheating) even though he wasnt playing at the time.
You can never know if that "just in time" comment was from a gallery member, or a "plant" who casually watches his buddies opponents then relays hints for game strategy. There should be a clear understanding before the start of the Tourney that all comments to active players in a Match will not be tolerated.
Scenario 2:
a player forgets to search for a Sangan during their Last Turn.
now, the opponent notes that they forgot to search, and calls the judge over.
the opponent has already begun their turn, drawn, and summoned a monster.
This is the most common event ever! We have all probably seen a
Sinister Serpent or two get left in the Graveyard during the Standby Phase, and not because the player chose to leave it there. We have all sent a Witch or
Sangan to the Graveyard in the heat of a focused battle, and forgotten to resolve the mandatory effect (unless negated), usually because of simultaneous effects resolving.
This scenario is a tough one only because it causes so much to be remembered. Did the owner really not search for a card? Was the effect negated? Did
Sangan actually even leave the field and go to the Graveyard?
If the opponent of the player summons a monster, I would have a difficult time allowing them to search for a monster as now they have an advantage over their opponent because they know part of his strategy.
Would they merely have searched for
Cyber Jar, not knowing what their opponent would have done on their turn, or know that their opponent has summoned
Black Luster Soldier, they would choose instead to search for
Exiled Force. I would not allow the search and issue a warning penalty.