A 22nd reason why Snape is a Good Guy

[Hannah]

No: HPFGUIDX 133472

<snip of Krista's list of 21 resons why Snape is a good guy>

Hannah:  Nice list, Krista!  I'm convinced that Snape acted on DD's 
orders.  I think that's what Hagrid overheard them arguing about in 
the wood.  DD knew what was coming.  I have to add another reason 
though, that I think strengthens the case:

22. Where was Fawkes in all this?  When LV AK's DD in the DOM, Fawkes 
appears from nowhere and takes the spell.  So why not when Snape does 
the same?  Why not before then, when DD was clearly weak and in 
trouble?  The bird is a lot closer to the action than in the DOM.  The 
only reason Fawkes does not appear, is because DD wants to die, for 
whatever reason.  Snape acts on DD's orders, and Fawkes does not 
intervene.  

Hannah