Clue for the "ancient protection?"

[Kelly Grosskreutz]

No: HPFGUIDX 57611

I was rereading the first two chapters in PS/SS last night, when I came
across this passage.

The Dursleys are discussing what to do with Harry when Mrs. Figg calls to
say she can't take Harry because she broke her leg.
"You could just leave me here," Harry put in hopefully (snip what Harry
could do alone).
Aunt Petunia looked as though she'd just swallowed a lemon.
"And come back and find the house in ruins?" she snarled.
"I won't blow up the house," said Harry, but they weren't listening.  (US
hardcover p. 23)

It's interesting that Petunia uses that particular phrase to describe how
disastrous it could be if they left Harry home alone.  Maybe part of his
protection is to not be alone outside of the WW.  They usually leave him
with Mrs. Figg.  Since she's not available, they toss out the names of Aunt
Marge (Vernon's relative) and Yvonne (friend of Petunia).  We can speculate
why the Dursleys or Mrs. Figg could protect him, but why would Marge and
Yvonne be considered adequate protection against "finding the house in
ruins?"

Kelly Grosskreutz
http://www.idcnet.com/~ivanova/