Ah, yeah, check this one out, just went through it.
It seems that Abe is right there, next to Scrab, where suposedly he should be crouching. I got this bug by going to the next screen, then dodging the Scrab, coming back, and then jumping towards that little area again. You should try it (remember, I'm using the PC version at this very moment).
Geez, it has been a while ever since I got to Stockyards again to get back to RuptureFarms... This will be kinda tough, now. =P