Possible OotP Flint?

[purple_801999]

No: HPFGUIDX 61806

This thought suddenly dawned on me. Why did Harry not see the 
thestrals when he left Hogwarts last year at the end of term? I'm 
assuming Cederic's death is the one that allowed him to see them in 
the first place. But in GoF when everyone is leaving they are still 
described as "horseless" and Harry does not see them until he returns 
in September.

Thanks,
       Olivia