That's one of those "if I don't make it..." scenes.
As evidenced in the first picture of the spoiler thread, Rick and his warriors seem to be high tailing out a back entrance somewhere after possibly entrapping the gov and his crew inside the prison with the walkers.
I suspect the others of the group are already on the road, heading to parts unknown......
Are they at the prison or at Woodbury? I don’t remember a lot of graffiti at the prison.
Actually, if you look closely at the first picture, they are in front of a boxcar sitting on RR tracks - makes me think that while the Gov is at the prison, Rick's group is making an assault on Woodbury.