A slightly oddball question. Let's say I have two Sorc 10/ Force Missile Mage 5. Let's just say.
They both have Overpowering Missile:
Overpowering Missile: At third level, the force missile mage's magic missile spells become especially potent, breaking through spell resistance more readily than normal. She gains a +2 bonus on caster level checks to overcome a creature's sell resistance with the spell magic missile. This benefit only applies to magic missile spells she casts. In addition, a force missile mage's magic missiles penetrate shield spells and brooches of shielding as if they didn't offer protection from the spell.
and, they both have Reflective Shield:
Reflective Shield (Sp): At fourth level, a force missile mage becomes immune to the spell magic missile. For the purposes of being affected by magic missile, a force missile mage is constantly treated as under the effect of spell turning, thus reflecting offensive magic missiles back at their caster. If that caster is protected by the shield spell or a brooch of shielding these reflected missiles are negated. Missiles reflected against a caster who also has a spell turning in effect require the force missile mage to roll on the spell turning mishap chart (PHB 283).
So, given that they are throwing Magic Missiles at each other (they're not all that bright), how would they interact? Would they function as normal, would both players have to roll on the spell turning mishap chart, or would they just cancel everything out?