Thestrals Again

[lagattalucianese]

No: HPFGUIDX 145668

La Gatta Lucianese:

Odd, in GoF.37, even though he has witnessed Cedric Diggory's death, 
Harry sees "the horseless carriages that were trundling up the drive" 
(well, the exact wording is, "Hermione turned away, smiling at the 
horseless carriages...", but since the point of view is Harry's, we 
can assume that he too is seeing horseless carriages; at least he 
expresses none of the shock he later does at seeing what is pulling 
the carriages). It isn't until OotF that Harry is actually able to see 
the thestrals.

So, my question is, does it take a while for thestral-seeing to set 
in, or did JKR drop a byte in there somewhere? ;D