User blog comment:Ironreaper/Retcons and Contradictions in the Reapers/@comment-2250460-20120419054338/@comment-4947725-20120419181412

I think that Rannoch counts because the fleets clearly couldn't do it on their own. And Tuchanka counts because he had to activate the keystones. Think of it like this: If Shepard shoots someone with his gun, who/ what killed them? Was it his gun? Was it his bullets? Of course not. Pulling the trigger is only different from activating the keystones/aiming the laser mechanically, it doesn't change the fact that Shepard did it. Shepard performed an action, and as a direct result of that action, the Reapers died. Shepard killed those Reapers.