Brake Master Cylinder problems of the 2015 Nissan Rogue

Was driving on a city street at 9:00 a. M. During morning traffic. Approached a red traffic light with stopped traffic and when I applied my brakes the brake pedal went to the floor and I had no brakes. I swerved to avoid stopped traffic and ended up in a landscaping area, still no brakes and crashed into a tree head on. As a result there was a landscaper working in the area where I crashed and he was struck. He suffered broken bones and I suffered a dislocated shoulder, fracture sternum and bruised tail bone from the car going air born. It appears the brake pedal assembly failed and detached from the brake booster push-rod/master cylinder assembly. We you press on the brake pedal is stays down on the floor and does not come back up. You have to manually move it up and down and there is a metal to metal clicking sound during movement. I have a video of the issue, but your system will not allow me to attach it.