A question I've not seen considered. Paul was actively giving Lechmere and Mary a wide berth as he said he was worried about being accosted by a gang. So they're on the pavement and he's either in the road or on the other pavement trying to keep his distance and get past them. If Lechmere was the killer wouldn't he have just kept quiet and allowed Paul carry on his way ? Calling out to him suggests he wanted unnecessary involvement which suggests he wasn't the killer to me. Otherwise he'd have let Paul pass without arousing any attention. Or am I missing something ? 

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