. Of course I have the whole strip from July 15, 1934 since you supplied it, but really only the spanking threat is important, and the version you have here is more legible, so I see no need to post the whole strip.The threat from May 4, 1940 I've actually added to Smilin' Jack Spanking #5 as a follow-up.
I think Joe Patterson was really taking a chance by ordering Mosley to kill off Joy Beaverduck. For one thing, Mosley might have refused, and perhaps more seriously the readers might have resented it (see e.g. the reaction to the killing of Gwen Stacy in Amazing Spider-Man #121). This kind of thing was certainly done repeatedly by Milton Caniff, but we're still years before Steve Canyon here (1940) and I honestly can't remember Terry and the Pirates well enough to say whether Caniff had done the same sort of thing there.
There is a great problem with serials, and it is simply that since they're supposed to go on forever for financial reasons, artistic progress is limited. You can kill off Prince Hamlet in Hamlet, but only because it's a stage drama and not a television series or comic strip (one reason why the stage drama is artistically way ahead of the other two media). Can you make up for it by following the Caniff model and introducing a major but temporary character who will later be killed off? Without meaning to duck the question, I'm going to have to leave it for another day and probably a very long essay
.
nice find Phil 
did manage to find a good spanking threat from October 14 of that year:
Whether or not you consider this an actual spanking or a missed opportunity I leave to your own opinion. You may be of the notion that converting an airplane's tail section into a paddle is too over the top to consider this a spanking as opposed to a beat-down. 
Simone is captured and arrested. Almost immediately she escapes from a local jail and there is talk of possible revenge but I didn't find mention of her in the strip again.