Re: re: "...it's equally likely to shatter in a place where it cuts the wielder"
Have seen with my own eyes, landlord attempt to eject folk from pub, one of them broke a Pils bottle on the table and went for the landlord with the jagged end. He chased the landlord round the pub with mates in tow trying to hold him back.
But most glass attacks are done with glasses, not bottles.