2 washings are set side by side, and they belong to 2 levels of a person. Water cleanses the outer nature, the surface repentance that only rinses behavior. The stronger baptism is the fire, the awakened root-energy that ignites low in the spine and climbs, burning through the whole body to purify it from within where water cannot reach.
The one who brings fire is mightier because that inner heat changes the very substance of a person, while water only wets the outside.
Water: the outer washing, the surface cleansing of behavior that rinses but does not transform.
Fire: the awakened root-energy that ignites low in the spine and rises, purifying the body from within.
Shoes: the lowest covering of the self, the earthbound outer layer worn nearest the ground.