A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Each player in turn order starting with you may choose a card in his hand. Discard all chosen cards. If exactly one player's card has the lowest Focus Value of all those cards, he gains a province to the left of his leftmost province. If exactly one player's card has the highest Focus Value of all those cards, permanently increase his maximum hand size by three, and he draws three cards.
So what happens if only one person discards a card? Does he get both effects or neither?
Each player in turn order starting with you may choose a card in his hand. Discard all chosen cards. If exactly one player's card has the lowest Focus Value of all those cards, he gains a province to the left of his leftmost province. If exactly one player's card has the highest Focus Value of all those cards, permanently increase his maximum hand size by three, and he draws three cards.
So what happens if only one person discards a card? Does he get both effects or neither?
If only one player discards a card, it will have both the highest focus value among the discarded cards, and the lowest focus value among the discarded cards. Therefore the player who discarded will receive both benefits.