This guy is absolutely suiciding
I used to take Insulin subcutaneously at the fatty area of the neck and that's what the doctor told me to do and some vaccines can be taken at this area as well
but the muscle found at the neck cannot tolerate any injections, Intramuscular injections should never at any way taken at this area
I wouldn't be surprise if he died, lets imagine if he inject it at a vein, he will die because it will go up immediatly to the brain