You don't intervene, for that exact reason.
If you challenge him he'll fight back. That's just dumb. Don't invite a confrontation, no matter how gallant you think you're being. Instead you should just stand too close, hover around and generally force him to be aware of your presence. Break their privacy and he'll stop, because it's a big jump from hitting his missus to picking a fight with a stranger. I've done this a dozen times, in spendy restaurants as well as in airports, furniture stores and rough council estate pubs, yet my nose remains as linear and handsome as the day I was pooped.
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Mon 17 Jun 2013, 12:39,
archived)
If you challenge him he'll fight back. That's just dumb. Don't invite a confrontation, no matter how gallant you think you're being. Instead you should just stand too close, hover around and generally force him to be aware of your presence. Break their privacy and he'll stop, because it's a big jump from hitting his missus to picking a fight with a stranger. I've done this a dozen times, in spendy restaurants as well as in airports, furniture stores and rough council estate pubs, yet my nose remains as linear and handsome as the day I was pooped.