Liz Sly is not alone in reporting rumors: Economist is reporting SIGNS

"ISIS, for its part, has barely been battling against the regime while it sets up an intelligence force and tussles with rival insurgents for Deir ez-Zor, another eastern city; indeed, there are signs that it tacitly co-operates with Mr Assad’s regime."   I don't mean to bother you, but what are those signs?  Stars in the skies?  Black cat crossing the street?  What?  Is the foreign editor of Economist asleep at the wheel?