Single magpie attacked 2 adults and 1 5yr old boy on bike with blue helmet. Multiple swoops, making contact with blue helmet. Stood it's ground when landed but didn't move as long as eye contact was maintained.
I was riding with the bicycle club, going rather slow at the front when it swooped me twice, my wife was 20 or so meters behind me, also got swooped multiple times. There were about ten of us on the ride, and it swooped almost all of us. It never made contact though, so I don't really think it's heart was in it.