OK
I just finished re-watching Season 6 Episode 1 and paid attention to the timeline.
All of the black and white scenes end after...
-some wrap-up of events from Season 5,
-discovering the walker quarry,
-saving Ron from the walkers,
-all of the planning for dealing w/ the quarry walkers,
-Carter talking about killing Rick,
-Carter holding a gun on Eugene...
It seems that the flash-back point is from
how they -thought- it would be to deal with the quarry walkers
to how it actually went down.
Re-watching Season 6 Episode 2...
When the truck crashes into the wall at Alexandria,
they show a rear view of the semi truck with blood dripping out of the bottom of back slide-up door.
Don’t know what that means...if anything...