DocsMistake's page

Passing the buck again down the line would kinda defeat the purpose wouldn't it, since Butterfly's Sting doesn't give you an attack it just makes the next one auto-crit wouldn't you just let the 3rd person in line (The one after the second user of Butterfly's Sting) take their AOO first if they have a better crit than you as long as they are also flanking with them to trigger Outflank

Carpet of Flying is a pretty great defensive item against most melee enemies, if they cant reach you they cant hurt you. Personally I use one on my barbarian to let me charge with a height advantage and ignore difficult terrain, so it can be an offensive benefit as well. It is a bit pricey though.

Arcane Trickster prestiege class from the CRB