Sorry if discussed earlier, but in that pic showing the blood in the crevice of the concrete:
http://www.websleuths.com/forums/sh...June-2014-*ARREST*-17&p=11075211#post11075211
The discolouration in straight lines around it appears that a broom may have been used to sweep away water.
Could that simply be the direction that a body was dragged? I'm not sure I understand what is meant by "straight lines".