Assassin
If this model either • Did not begin its activation in BtB with an Enemy model, performs an action that Targets that enemy or brings it into BtB with that Enemy model, and started outside of LoS of that Enemy model and remains outside of it's LoS during movement • Or if the Enemy model is Surprised This model may roll three dice for any Damage Rolls caused by any Attack and choose two to add together ignoring Weak and Strong Traits
Assassin trumps Strong and Weak. Technically the player would choose which trait to resolve first, but there is no reason not to choose Assassin if able as the quantity of damage dice is specified and would not change due to the addition of Strong or Weak.