I don't know if this could be the "bursting of the bubble" they're talking about. But I think this just just a normal thing with bitcoin. Especially Christmas is coming and a lot of people trying exchange bitcoin to fiat so they could use it.
This is a reasonable reason because at the time of Christmas everyone tries to throw dinner to their families in which all of them exchange different gifts which they earned through their jobs. Now the bitcoin holders also have families to look after, so this is totally understandable. Moreover, it is the normal custom that every year near the Christmas, the businesses go down because of the holidays, so it is just another Christmas and nothing else.