SI.com's Peter King writes letter of caution to NFL players

[Vlad]

(01-16-2016, 02:37 PM)rfaulk34 Wrote: H2H would be ok, but no, i wouldn't be for a RB driving the crown of his helmet into a defender. 

Defenders are 100% responsible for avoiding HnN hits on defenseless receivers. RBs should be 100% responsible for avoiding spearing a defender, short yardage or not. 

Impossible to avoid in short yardage. Too many bodies in a small space, hence the term "tackle box".