[HPforGrownups] [HBP] Why didn't Voldemort Modify Hagrid's Memory?

[Bart Lidofsky]

No: HPFGUIDX 190184

Cassandra Wladyslava:
>> First off, I'm sorry if this has already been discussed. In fact, I'd be
>> surprised if it hasn't been.
>>
>> I was just listening to HBP (The Stephen Fry Ver.). Voldemort modified
>> Morphin's memory to make him think he had killed the Riddles and Hokey the
>> House Elf to make her think she had killed Hephzibah Smith, but didn't
>> modify Hagrid's memory to make him think he had set Aragog on the
>> muggle-borns/opened the chamber of secrets.
>>
>> Any thoughts as to why?
Margaret Dean:
> Maybe as a half-giant, Hagrid is resistant to some types of spells.
>
> Maybe Riddle figured he couldn't get away with it at Hogwarts; one or
> more of the professors would notice.
>
> A couple of guesses just off the top of my head...

Bart:
     How about Riddle was younger, and not as skilled a wizard at the time?

     Bart