Yondaime swapped places with Obito and Tobirama who had both been standing surrounded by the black bb spheres. So Yondaime is now standing surrounded. I don't believe the spheres had been targeted yet.
Even if they were targeted, Both Minato and Tobirama are Edo Tenseis, that is the meaning of what Tobirama said in bottom left panel, page 12. (mangastream)
Tobirama expects both he and Obito to be destroyed, but as an Edo Tensei, he'll just reformulate later.