I've never been either the subject or the object of either verb, but bottling - I think - involves breaking the bottle first and then using it as a weapon. When you glass someone you start with an unbroken glass and aim for the victim's face.
I was told that you should break the bottle first. Apparently, there is a trick to it to ensure you don't cut yourself- most people would think you slam the bottle down on the tabletop, but that would allow glass to fly everywhere and the bottle would end up pointing the wrong way. The smarter thug breaks it against the underside of the table with an upwards stroke, so glass falls to the floor and the weaponised part is naturally moving upwards into an offensive position. At least, that is what I was told one night by a scary bloke down the Cross Keys.
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