It seems like, charitably, 95% of the time, whenever a DL jumps offside, and the OL reacts, the refs will flag the OL for a false start. Every now and then, they'll flip and hit the defense for causing the false start. I'm just curious on what the standard is for them calling it one way or the other. I know there's encroachment, where the defender has to make contact with someone on the offense, but this appears to be different.
Early in the Packers/49ers game, BJ Raji jumped across, the OL across from him moved, the refs flagged it, Raji immediately reacted like he knew he was at fault, and the refs ended up penalizing the offense.
If anything, when a DL goes off sides, but still has time to get back, I see a delayed reaction from one of the OL trying to play it off like he was drawn off sides by the DL...and they almost always call the penalty on the DL.
As for the play you referred to, BJ Raji appeared to have jumped off sides, but they called it on the QB (Kapernick) for moving his hands and drawing Raji off sides. (They've called Eli on the same deal a couple of times.)
All they have to do is watch...it's a very easy penalty to spot.
Use your DVR (if you have one) and watch it again....
Hope that helps.
There are many things for which we can criticize the officials, but this is not one of them.
Because it's very hard to go against instinct and NOT move when a 300lb dude (or anyone really) comes at you suddenly, full force & in your face. So now it's called if the DL gets close enough, meaning in the neutral zone. But if the OL reacts too slow trying to get the call on the D, it's on the OL. Also why if the OL doesn't move & the DL moves back presnap it's no call. And why if the DL simulates the snap / yells hike, if caught that's a penalty on the D
The Raji call was wrong but generally these have been correct