That is the power and beauty of negative lightning at close range. If that were a positive lightning discharge at that proximity, the windows would have been very likely blown out.
Numerally NSW is Being Issued A Thunderstorms Same Here In Sydney 3:35 Coffs Harbour and Grafton and Maitland Casino NSW And Mindaribba and Wirrgulla Dungog And Gloucester and Wingham and Taree and Kendall and Wauchope and Macksville and Nambacca Heads And Urunga Satwell And Brisbane and Adelaide and Gold Coast and Crystal Brook and Darwin and Perth 3:35
Aussie storms are the best! They really are incredible. It seems, however, that your camera equipment tends to distort the sound a little bit. It's not your fault, though, so keep on recording these.