I'd have to agree with Karinsdad here on how it works.
What I think happened here is the deflection bonus is causeing the confusion, to someones who's overthinking it that would imply its a 'forcefield' effect so damage is split first, rather than seeing it as a seperate effect of the spell.
What I think happened here is the deflection bonus is causeing the confusion, to someones who's overthinking it that would imply its a 'forcefield' effect so damage is split first, rather than seeing it as a seperate effect of the spell.