Actually, thinking about it, given Sherlock's previous encounter with Mary it may have occurred to him that he and John had better both be wearing something likely to stop a bullet just in case. I presume he had a couple of hours to send Bill off to fetch something, in between shifting furniture and planting perfume bottles at 221b.
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timeasmymeasure
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Date: 2014-02-01 01:06 am (UTC)