Who says he killed them first?

Close! It would be more like:

J’ai envie de te manger.

Putting toi at the end doesn’t make the person the recipient of the action.

Same!

What series is this?

That doesn’t surprise me too much. They’re both a good bit different than python. It’s okay to take a little more time with each of them. Maybe try building one simple thing in both for more of a 1-1 comparison.

If you’re trying to prepare for a couple of years in advance, it might be worth spending a day playing with each language just to see which one feels best to you. Both languages should be able to do anything you want but some things will probably be more difficult in one or the other. I’ve never used swift, but I know rust can have a rather steep learning curve. That may be deterrent enough for some people, but that’s up to you to decide if that struggle is worth it.