There are many beings that would love to set things that way for Dresden, but how many could actually do it? I mean, many of them (Nemesis included) could have altered Rudolph mind to have him do that, but I believe that no one but TWG could have arranged for Bradley needing to let Rudolph, the falling gun, Rudolph recovering of Bradley hit at the exact time to move, see Murphy using the bazooka, grabbing that gun and Harry's realizing just at that moment that he could not cast Forzare (If he had realized that before hand, he would have done other things, probably attracting all Rudolph fury over him). So yes, I think it was TWG. Why? I am not so sure, but Murphy said herself that she wouldn't be herself anymore, so the TWG arranged for a glorious, heroic moment before she died. And perhaps it acted as a test for Harry too.