[ Emerald leans forward so she can look at the map while Sun explains. It seems pretty straightforward, the only problem being that while the guy seems to be within a radius of the homeless people, they have no way of knowing what direction they'll go off in.

Which leads to the question of how they're tracking where the strays get off to. ]

They'd have trouble figuring out which way the strays were going. The number of alleys is limited now but it wasn't in the earlier killings.

[ She points to some of the other ones that it seems like there were more side streets. ]

Someone with a great local vantage point or the killer is already in the group, maybe?