scathing tirade and terrify dont work with intimidating because when you downgrade you cannot remove dice, you can onlh change a red to a purple, and since there is no red in the check they dont work (unless the Gm flips a DP or rules that circumstances warrant an upgrade) .
opposed players cant use nobodys fool , or intimidating as these only trigger when someone gets targeted with the "attack", since terrify and scwthing tirade are effectively AOE then they cannot apply.
This is one of the reasons I dont lkke the idea of influence working with Tirade because of further interactions witn talents lkke no escape. ie a warden (I mentioned this earlier) who could use the results from the force dice (FR6) on a scathing tirade check to get another 3 or 4 NPC to lose their free maneuvers. The devs however did previously rule that it wasnt possible to add dice from influence on a terrify check , even if the player did offer to split their available FR between influence and terrify eg rolling a terrify action with 2 Force Dice on terrify and 4 on influence is not possible , you can only use up to 6 dice on terrify, that is it. perhaps the same rule they referred to for that alao refers here, but they did say it wasnt possible to mix like that.