why couldn't Vernon Dursley hold Harry

[Derek Thorburn]

No: HPFGUIDX 131604

Yesterday, I started listening to OotP and once again I've noticed another 
reference to someone being unable to hold Harry - this time, Uncle Vernon. 
I seem to remember that in PS, Dumbledore tells Harry the reason why 
Quirrell couldn't hold him was because of the protection Harry's mother left 
in him.  Now, in OotP, we read that Uncle Vernon couldn't.  As far as I'm 
aware, the only other time Uncle Vernon grabbed Harry was in CoS, when he 
dragged him upstairs, following the letter threatening expulsion from 
Hogwarts if any magic was performed during holiday time.  So I'm wondering 
whether this incident in OotP was either some magic inside Harry, or once 
again, help from Lily.

Derek