this doesnt have anything to do with this topic but just here me out
this is a theory that contains gesses to hp book 7
snape is good and otha things
In book 2 the chamber of secrets when harry was down in the chamber he said something of such loyalty to dumbledore (dd) tha fawks the phenoix showed up to help him
so fawkes shows up wen loyalty is served to dd
then in book 5 the order of the pheniox fawkes shows up to save dd from that avada kedavra curse so this also mean that he shows up when dd needs him.
so y didint fawkes show up wen dd needed him most when the avada kedavra was being shot rite at him by snape
my theory is tat dd ordered fawkes not to act and tat he had t stand down and not help him or harry.
thats my theory and send me feedback bout wat u think bout it...