The OAK punt would pin the 49ers inside their own 5 yard line.
1st & 10
Gore Inside zone for +3 yards
2nd & 7
49ers: Spot concept to Kap's right with a backside In route (VD)
OAK: cover3. #24 is Woodson who is the weakside hook/curl defender (zone in the middle of the field, I forgot to highlight him).
After a playaction that does not fool the strongside curl/flat defender (defender covering Miller), Kap partially rolls right. Woodson leaves his zone to roll coverage to the strongside.
Of the Spot concept, Miller is the only one open and it's only for a very minimal gain, if that. Kap properly red lights all three routes in the Spot concept. Because Woodson (#24) has rolled coverage and is essentially double covering Boldin's Curl, there is a passing lane to VD's In route.
Kap has time in the pocket that is about to end via a bullrush by a LB that got MMartin backpeddling (mentioned by jonnydel in the OP). Kap should be looking to VD on the backside by now.
With the time that Kap has remaining of his pocket, Kap actually starts his windup. Blue are the deep zones. Orange is the underneath zones with Woodson in purple because he has left his assigned zone as the weakside hook-curl defender. Notice the passing lane to VD.
Same moment as pic above. From this angle, it looks like Kap never moved off of the Curl (Boldin). If Kap is looking at VD, which I don't think he is based off the direction of his helmet, then I don't know why he didn't pull the trigger to VD. If Kap is pump faking to Boldin, then that's a waste of time that should have been spent targeting VD.
Sacked for -3. Maybe I'm being too harsh on Kap here, but when there is one defender covering Miller, and 2 defenders covering Boldin, where does Kap think that 2nd defender covering Boldin came from? Using that logic, VD's In route is available.