SR3 magic questions regarding Spell Defense, Shielding and Reflecting

Hi all, 

SR3 rules, page 183 discusses Spell Defense.  It indicates that the   
total number of Spell Defense dice is composed by zero or more   
Sorcery dice and zero or more Spell Pool dice.  It indicates the   
magician can choose how many of the allocated Spell Defense dice are   
to be used in any specific spell defense action.  When used the dice   
are not usable until the pools refresh.  I understand how this would   
work for Spell Pool dice that were allocated to Spell Defense and   
used.  However, what happens with Sorcery dice that were allocated to   
Spell Defense and used?  Would they be considered used until the   
Sorcery "skill dice" automatically refresh for the next action that   
the mage can take this turn?  I am trying to look at how a skill like   
Pistols is used and how the one using Pistols does not lose dice   
using the skill. 

I assume once I figure out how Spell Defense works, both Shielding   
and Reflecting will be easy.  One assumes that if an initiate were to   
choose to have a team protected both by Shielding and Reflecting a   
total number of dice would be allocated to Shielding and another   
total to Reflecting, thereby greatly reducing the number of dice in   
the Sorcery skill and Spell Pool.  I would assume that once an   
initiate chooses to allocate dice towards Shielding, and uses them   
all up, that initiate would not be able to reallocate dice from   
Reflecting back to Shielding until an action allows this.  I assume   
that one must specifically state that X number of dice from here is   
for Shielding and Y for Reflecting. 

Comments? 

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·𐑕𐑒𐑪𐑑 ·𐑣𐑺𐑦𐑕𐑩𐑯 Scott Harrison