Ward in the slot.
Fire zone blitz vs All Curls

The 49ers will usually play a pattern match with their two curl/flat defenders using the SCIF technique (seam/curl/flat) when calling a fire zone blitz. On this play, this is Bethea and Ward.
(I think) Ward is supposed to ride the #2 WR (slot WR) up the seam and pass off coverage to one of the deep zone defenders, then play the Curl zone while letting the QB take him to the Flat if there is a threat in the Flat. Here, Ward matches the #2, the first vertical he sees.
On the other side of the field, Bethea stays in the Curl. It's an easier read for Bethea because there is no slot WR on his side of the field.

With Bethea playing the Curl zone, the Curl on his side of the field is defeated - with Cox over the top, and Bethea underneath.
Ward has vacated his Curl zone, choosing to match the #2 in man coverage. This leaves Cully, playing over the top, at the mercy of any comeback type of route - in this case, a Curl. If Ward stayed in his Curl zone (blue cross), it would defeat the Curl.

Completed to the Curl for a 3rd down conversion.













