User blog comment:Legato Bluesummers/borsaliono powers? also know as (kizaru)/@comment-3119203-20111004124220/@comment-1889545-20111006064000

I don't think it is the foot, more the sheer energy of it. If he converts himself to high energy photons, whatever the photons collide with will pick up a large amount of energy. This in turn could produce massive kinetic energy in both the bonds in molecules and the atoms themselves causing the molecule to build up a lot of heat energy causing the explosion.