Shared core?

[mooseming]

No: HPFGUIDX 99631


I have a cannon question but its from a quote to do with the 4th movie
so hope this doesn't qualify as movie contamination! If so, apologies
in advance.

On Ceefax this morning Daniel Radcliffe (sp?) said he thought Harry
would die as he and Voldemort share the same core which you see in the
4th movie.

I cannot think what in book 4 would equate to this observation, does
anyone have any ideas?
 ta
jo