Matt, I'd need more details or a page number reference before I could comment on the particular account you have read. But I'm wondering if you might have seen a reference to Lawrence Beesley's movements immediately after the collision, when few people were aware of any serious problem and the Smoking Rooms were still operating as normal. Beesley (a 2nd Class passenger) described how he went up the 2nd Class stairway to the boat deck and then down to the Smoking Room on the next deck below (or words to that effect). Now, some writers have interpreted that as meaning he found his way into the 1st Class smoking Room on A deck. But in fact the 2nd Class stairwell passed right through A deck as if it wasn't there, so for Beesley the next accessible deck on the way down would have been B deck, where he entered the 2nd Class Smoking Room. The people he spoke to there can be identified as 2nd Class passengers like himself.
.