Yesterday the we lost UFC on FOX 19 headliner Tony Ferguson to a training injury, and though the Powers That Be are still working on finding a late-replacement to face Khabib Nurmagomedov, we now have some insight on what felled Ferguson.

Lung injury. Ugh.

As per the TUF winner’s Instagram:

People die from fluid in their lungs, so Ferguson’s injury is no joke. Best wishes for a speedy recovery.