Both parents were probably out grocery shopping and the 3 young ospreys had the place all to themselves when suddenly for no apparent reason two off the young chicks started squawking at each other. During the squabble, one osprey had actually lunged and grabbed the other by the neck more than once. Then about 3 minutes later it was all over as if nothing happened. Maybe two is company and 3 is a crowd, either way they should be big enough to leave the next in about a week.