Sounds like it could go very wrong very quick.

Ive only been diagnosed with 5 concussions. But, in high school and military I used to headbutt things for fun. Im sure Ive added on a lot of undiagnosed ones in there as well.

Things arent as pretty for me nowadays. Be careful, your friend doesnt want to go through what most of us here go through on a daily basis.


Forgot to add, I used to do amateur MMA a lot. The gym I went to made me give it up after my 4th diagnosed concussion a few years ago. It should be noted, from what Ive been told just from my pcp, is anything over 3, you should just stop that sport.