>>719248808
How many turns was it before they completed it?
13 Orphans is the most common yakuman to intentionally go for, and really easy to spot through discards. If a player is in a position where only a yakuman will change their standing and you see them building it, don't fuck around with it until you see 4 of an honor/terminal in the discards and you know it's dead.
Complain to me if they get you with a turn 3 riichi baiman waiting on two different honor tiles