I just noticed a giant plot hole in the third Harry Potter book/film. Towards the end, when Harry and Hermoine go back in time to save Buckbeak and Sirius, a scene plays out in which Hermoine throws a pumpkin seed at the back of Past Harry’s head in order to draw his attention to Dumbledore and Fudge approaching Hagrid’s hut. When she does this, Future/Present exclaims that he too felt the seed hit him. From this, we can assume that Future Harry feels exactly what Past Harry feels.
If we are applying this level of rationale, then the scene that follows, in which Future Harry casts a Patronus charm to save the lives of Past Harry and Sirius from the Dementors. But, and this is where the plot hole lies, as the Dementors are sucking out Past Harry’s soul and causing his body a great deal of pain and torment, shouldn’t Future Harry also be affected? He should be curled up on the floor too, unable to cast the Patronus. By rights, Past Harry (and, by extension, Future Harry) and Sirius should both be dead.
Lazy writing, JK. I’m disappointed.