Traps, and similar situations (ambushes, exploding opponents), can not wipe the party (the 2 main characters are what count), if the entire party isn't grouped together

First of all double negative in English is incorrect. English is not my first language but at least I remember this from school.

Second about keeping second character offhand...I don't know if you are playing the same game I am playing or you don't know what you talking about the least.

Honour mode on first try is impossible. Short answer.