Those glorious birds will attack anything (if that's what happend). Seen one end up stuck in the sail of a Drifter. Deep gouges in sail planes and an in flight photo of one (good 6ft+ wing span) destroying the sail of a hang glider.
From experience there is a particularily nasty one that used to live at the dump at Dalby he/she has moved down the road to Warra. Generally comes in from high and behind and you don't know you are a target until you hear the thud.
Nesting/Mating (and attacks) usually start around August September and can last well into the year. Some (very few) Wedgies will be unsociable all year round...