As I was driving out of my apartment I saw to geese plunging into the water as a third goose stood by onshore. I pulled over and started videoing to two in the water who by the time I got close had each other in a ferocious grip and were attempting to beat each other with their wings. It was brutal and went on for about 10 minutes when one broke away and swam off quickly. The other gave a little chase but then returned to shore where the third goose was still at.
Having looked it up the one goose was protecting territory (nesting) or it may have been a mating issue.