[HPFGU-OTChatter] Re: Question about Pure Bloods and House of Slytherin

[Random832]

> Kemper now:
> This suggests that Mr. Filch, a Squib who apparently grew up within the culture of
> the WW, believes himself to be one of the 'enemies of the heir' of Slytherin.

Take "enemies of the heir" apart instead of analyzing it as a set 
phrase. He [reasonably, if incorrectly] believes the 'heir' to be 
someone who is currently a student. He [again, reasonably] believes that 
all the students at Hogwarts see him as their enemy (though he 
apparently believes this to be due to prejudice against him as a squib, 
rather than, say, his winning personality). And his cat has just been, 
so far as anyone knows, deliberately attacked.