Snape referring to LV as "The Dark Lord"

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No: HPFGUIDX 85563

As you all probably know, one of the things that JKR likes to do is 
suddenly interrupt when something important is about to be 
revealed.  This is one of her "clue patterns:" if we are suddenly 
interrupted, pay close attention because it may have significance 
later on.

I believe in Book 5, during one of the occlumancy lessons, in his 
anger Harry finally confronts Snape about him referring to LV 
as "The Dark Lord."  He asks him why Snape still refers to LV 
as "The Dark Lord," since the only people that ever call him that 
are Death Eaters.  Right when Snape is about to answer, they hear a 
sudden crashing and screaming upstairs (I think the firing of 
Trelawney) and Snape runs off, leaving Harry with the Pensieve.  
Could the answer that Snape was about to give have any significance 
to the plot?