Dispatch Communications - Shooting in cafe??

I came across this YouTube video on Louise Bisson's channel. The beginning has a bunch of random calls then at approximately 6:30 into the recordings...Denver dispatch calls into Jeffco dispatch. They are relaying info about the shooters inside the school. You can hear the chaos all over however I found it interesting that the teacher and 17 students inside the room in the cafe were being shot at while there was shooting going on in the library. Does anyone have anymore info on this? Take a listen...https://youtu.be/D9CUIlBOca0