GoF - Chapter Nine - a blast & flash of green light--sonic boom?

[vmonte]

No: HPFGUIDX 122084


charme wrote:
I have been focusing on Chapter Nine of GoF as in JKR's interviews
and chats she says that it was so difficult to write, she thought
about skipping the chapter completely. We pick up the action as
Harry, Hermoine, and Ron have fled to the woods after the
supposed "DE's" began having some Muggle sport. Please note that up
to this point, the trio had been hearing bangs and shouts from the
campsite, then Draco Malfoy appears:

GoF, Chapter Nine (US)

Ron told Malfoy to do something that Harry knew he would never have
dared say in front of Mrs. Weasley.

"Language, Weasley," said Malfoy, his pale eyes glittering. "Hadn't
you better be hurrying along, now? You wouldn't like her spotted,
would you?"

He nodded at Hermione, and at the same moment, a blast like a bomb
sounded from the campsite, and a flash of green light momentarily lit
the trees around them.

A blast like a bomb? A flash of green light? Does this in any way
sound like something we've possibly read about before? What other
than the Muggle sport, Winky, and the Dark Mark happened that night?

vmonte responds:
Funny, the first thing I thought of was of a sonic boom. And we
already know that this was also heard/seen at Godric's Hollow. I
don't mean to ruffle any feathers but could this be the sign
potioncat was looking for that might signal an event where time
travel took place? And I don't mean time-traveling a few hours back 
or forth. I mean the kind of travel where you travel a few (or a lot 
of) years in a short period of time. Just putting it out there...