Ningen's 'Treatise on the Nezumi' p2

L5R CCG Rules board, 3 April 2014

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.

A player, 3 April 2014

Multiplayer Open [bow]: Target a player. Until your next turn begins, each of you must invite the other to ally (if legal), and during Maneuvers, the invited one must assign a unit to an army where the other has a unit, and may not assign units elsewhere.

Following this:

ad1) What if multiplayer game that started with 3 players, but one of them was eliminated. At this moment this game loses its 'multiplayer' and it's then still sensless to use item's ability?

ad2) In 3 players game (player A, B and C), A uses this item and targets player B. Player B also can't attack player A?

Anyway i don't understand "(if legal)" part of item's ability. Asking for ally happen after choosing enemy you want to attack.

1) Attack Phase begins 2) you choose your opponent 3) you ask for ally

If i use this item and target player Y (in X vs Y vs Z game) what refrains to declare attack against him? Good Faith Rule? I thought that after declaring attack - as he becomes my opponent - all efects of 'forced allying' just fails ("each of you must invite the other to ally (if legal)") and all remaining effects fizzle.