It is not our job to "prove it". As you said, the coach can request a time-out to discuss a possible rule misapplication, but, we are not responsible for showing the coach WHERE a rule is in the book. If the coach can show us where we are wrong, we obviously change our call, but I'M the one who is from Missouri ("Show Me").
With that being said, in Situation 1, the answer is found in Rule 10-3-6b":
Quote:
ART. 6 . . . When teams have exhausted their 18 team substitutions or when no legal substitutes are available, an exceptional substitution is permitted only for an injured/ill player in the following priority: ...
b. By any legal teammate on the bench, regardless of previous position played. An injured/ill player replaced by an exceptional substitution may not re-enter a set in which the exceptional substitution takes place. A team may not play with fewer than six players if there is a legal substitute (including an exceptional substitution) available;
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In Situation 2, Rule 4-1-6 is quite specific:
Quote:
ART. 6 . . . Jewelry shall not be worn by players during warm-ups and/or competition.
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It does not say that jewelry may be worn if it is taped or covered. Wear jewelry=no play, period.