Does the first caster only take damage from the Wall of Fire spell if the caster of that spell is also inside of the globe? Or does the Wall of Fire not effect the first caster at all no matter what? This sentence is the one I'm having trouble with:
Similarly, the area within the barrier is excluded from the areas affected by such spells.
I'm not sure if that overrides the restriction of being inside of the globe or not.
Or does it come down to a matter of which spell is cast first? ie. putting a Globe of Invulnerability atop a Wall of Fire won't protect against it? Alternately, does it matter where the caster of the Wall of Fire spell is located when checking to see if the damage is applied. ie. If the caster of the Wall of Fire is inside or outside of the globe when checking to see if the first caster takes damage.