Say a wizard casts a delayed blast fireball and leaves it to charge up instead of detonating it immediately. Another wizard casts antimagic field and moves so that the fireball bead is inside of the AMF. Now what happens if the first wizard ends concentration to detonate the fireball?
Obviously anyone inside of the AMF won't be affected, but what about creatures outside of it, but within the blast radius of the fireball? Are they unaffected because the fireball bead is inside of the AMF and thus can't detonate, or are they affected because only the area inside the AMF is blocking magic?