Board Thread:Character Discussion/@comment-25375217-20170504033027/@comment-25926288-20170505201817

I think it was solely a thing for the audience. At best, the people within the house could have thought there was some weird draft of wind and did not pay it any attention. Fiona and Malcolm weren't too shocked seeing the fairies, so it just be that they weren't the sort of people that get startled easily.

Lights flicker when Baby Neal is being born, which David assumes to be something weird (although sometimes that is assumed to be Zelena). Lights flicker when Henry was born and went wacky, but the doctors failed to notice.

The candles going out is just a representation of the same: an energy surge.

Other notes: Zelena was born in the day (or no candles around). Regina's birth hasn't been shown. Baby Robin was normally born.