I don't see the warping so much as the outter piece to the Boba helmet *sprung* out,like...it just separated.I can't be certain, but some clamps w/some wood (to avoid unneccessary damage) and good,strong epoxy should make the part fix flush.Some minotr work/repair which might call for come additional sanding,filling and reshaping along with some paint work and that might be "as good as it gets".Its hard to say,but the photo does give one an idea what the issue is.Sadly,there really isn't anyway to flex fibergalss without doing some kind of surery and altering the helmet/area where it needs correction and repair.You might be able to get another casting from whomever sold you the helmet (don't quote me on that).