The so-called duel is actually a contest where each party can resort to surprising tactics.
However, most of the time, duelists are concerned about maintaining face—if they're shameless, they would simply ambush someone, so why bother with a duel?
Therefore, using poison in a duel is considered an excessive act.
Of course, one could use excuses like "I am a pharmacist" to justify it, though it's a stretch.
If someone says "I am an Array Master", winning by using formations, then they should use an Array Plate carried on their person, not set up in advance.
Without fairness, what's the point of having a duel?
If so, by simply declaring "I am the Shopkeeper", wouldn't one be able to summon a bunch of underlings to assist?
Thus, the current situation, where the Yongyi Duke and Lord Beiyuan's side, seems very shameless in everyone's eyes.
