Sounds like a sporting event and I guess sorta is. I’m not a full fledge birder but I believe this is what is happening… These Blue Jays are defending their tree that contains a hollow and their nest inside against this Red-shoulder Hawk. Blue Jays can imitate the calls of Red-shoulder Hawks to scare away other birds which can be noticed when visiting bird feeders.
Professional Insect & Rodent Exterminators