AThe bomb Dr. Kelly is working on has a plutonium sphere surrounded by explosive panels. By the simple expediency of cutting all the detonator wires to the same length, all the explosive panels will detonate simultaneously, crushing the sphere with the pressure of a million atmospheres, reducing its size to that of a walnut, increasing its density, and rendering the sub-critical plutonium "critical" (or "super-critical"), the necessary preliminary before the plutonium is bombarded by neutrons and a nuclear chain reaction is started.By removing one of the panels, she ruins the effect of the explosion and prevents the plutonium from going critical. The bomb still explodes, and fragments of plutonium are scattered everywhere (fortunately, most of the radiation will be contained inside the church).