Get Fred and George to transfigure half a supercritical sphere of nuclearbombium each (lasts a few hours), transfigure Freds into the same shape made of lead (lasts maybe half an hour), combine them into a sphere and teleport away with the phoenix that plan undeniably earned. (Yes, I know it was said everyone gets only one chance for a phoenix and Harry failed his)
Get Fred and George to transfigure half a supercritical sphere of nuclearbombium each (lasts a few hours), transfigure Freds into the same shape made of lead (lasts maybe half an hour), combine them into a sphere and teleport away with the phoenix that plan undeniably earned. (Yes, I know it was said everyone gets only one chance for a phoenix and Harry failed his)