Interesting: I don't watch Talking Dead and haven't read the comics. I did read the Entertainment Weekly recap, which seemed to think that Abraham's family was horrified because they had just seen him beat someone to death over a can of food. An easy assumption to make IMO, because even though I assumed there'd been a fight or danger of some kind based on what Abraham said to his family--but in no way did I suspect this.
There were definitely some missing blanks. I don't mind that as a strategy, and often like it in serial shows, where it sometimes means there are momentous blanks to be filled in later. I guess maybe this show is leading us to think that this will be Abraham's only flashback episode...
But also, what's not on screen that is in the comic, or is explained by actors doesn't actually mean it happened in the show--until it's explained on the show. On the one hand that happens to be a slant of literary criticism that I agree with (feel free to disagree), but also there have been enough differences from what I understand, that the source material can't be totally relied on. That also makes it fun for speculation, though.
Anyway, the storylines in the show itself are getting a bit off-pace now, but I suppose we just ride it out and things will start coming back together.