I think it derives from not wishing to be barred from the pub you start a fight in.
You're not likely to be barred for fighting adjacent to a pub, but, in most pubs at least, fighting inside is infra dig.
(PrufrockLucifer, son of the morning!, Sun 29 May 2016, 3:38,
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Bit pointless in this case
as he would effectively be fighting the landlord, which is going to get you barred no matter where you do it. But I suppose instinct kicked in.
(TSLunch, Sun 29 May 2016, 13:24,
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