Evocation Wizards in Pathfinder benefit from bonus damage to their offensive spells, but I am wondering how this relates to spells like Fire Shield.
Intense Spells (Su): Whenever you cast an evocation spell that deals hit point damage, add 1/2 your wizard level to the damage (minimum +1). This bonus only applies once to a spell, not once per missile or ray, and cannot be split between multiple missiles or rays. This bonus damage is not increased by Empower Spell or similar effects. This damage is of the same type as the spell. At 20th level, whenever you cast an evocation spell you can roll twice to penetrate a creature's spell resistance and take the better result.
Fire Shield: Any creature striking you with its body or a handheld weapon deals normal damage, but at the same time the attacker takes 1d6 points of damage + 1 point per caster level (maximum +15). This damage is either cold damage (if you choose a chill shield) or fire damage (if you choose a warm shield). If the attacker has spell resistance, it applies to this effect. Creatures wielding melee weapons with reach are not subject to this damage if they attack you.
Technically Fire Shield is an Evocation spell that deals hit point damage (albeit in an indirect way), but I’m not sure how to interpret the bonus damage rules in relation to this sort of spell. How does 'Intense Spell' increase the damage of 'Fire shield'?