I liked today's strip, despite my strong inclination to hate it because of the re-appearance of Shecky. The punch, while perhaps unwarranted, is a strong way to introduce the relationship that will hopefully continue throughout the story -- that is to say, Shecky is about the be Scratch's bitch for a while.
I can live with that. (I dread, however, that they will come to some agreement and it will be Nick Nolte and Eddie Murphy all over again.)
As for nits, there are some to be picked:
I could have done without Shecky's "Get it?" in the second panel. All it does is drag out the "fragment of overheard joke" trope from the first panel.
I'd also love to have seen a different approach to the last panel. There are a lot of extraneous lines that are confusing the issue -- we could have done without the texture lines on Scratch's belt/holster, and we don't really need more than one well-placed star-and-line around Shecky's head. We certainly didn't need what I'm guessing is the remnants of Shecky's bar stool in the lower right corner.
I disagree with others on the issue of context -- It think it's safe to assume that Scratch knows of Schecky, even if they've never been in-strip together before. The sucker punch is quite in character, I don't feel bad for Shecky at all -- seeing as I hate his guts.