Lets say i have X head Cannon on the field and y dragon head in the graveyard, so then i activate my premature burial brining y dragon head back to the field could i then equip y dragon head to x head cannon and if so what would happen to premature burial? would it be sent to the graveyard and if that happens what happens to Y Dragon Head? would he be destroyed along with P.B. or would he be safe? :?