When I think of Hashirama losing control of himself (in anger, in grief, whichever) and letting it all out I think of like. You know that scene in Sleeping Beauty where Maleficent casts a spell on the castle where Aurora is sleeping so Prince Philip can't get to it, and then there are dark, tangled, and twisted thorny trees and branches that grow around it. You know the aesthetic of a scary, dark forest during the night, where everything looks much bigger than it is, with looming shadows and the natural shapes carved into the barks of trees, the hollows, they look like faces, threatening, mischievous ones or ones contorted with fear, as if they were scared of the forest at night too. Yeah, that.