Subject: How much force does a pillow exert during a pillow fight and is it lethal??

My girlfriend and I were pillow fighting and I knocked the crap out of her
(unintentionally) and she complained of severe pain caused by my superhuman
pillow slinging.   Is it possible to hurt a person when slamming a seemingly
harmless pillow into the top   of their  cranium or is my girlfriend a sissy? 
Please tell me the force I am exerting with my 225  pound body slamming a pillow
into the top of her head.  Thank you for helping my to find the correct  amount
of force I should use when pillowfighting. -- P.S.  My girlfriend while crying
made me write this.

Re: How much force does a pillow exert during a pillow fight and is it lethal??