Finally, a payoff for Luca always trying to make Leon hold her hand while they travel. Now /LEON/ is the one offering his hand. And uh, apparently just in time.
Before the script was hammered out, I was instead envisioning Leon just taking her hand and leading her away in a huff after speaking with Ms Shepard, but I'm pretty sure that's also long before I had the idea for this whole Fair Getting Consumed Scene for the end of the chapter.
If that sounds like I'm spoiling the ending, remember: we've been seeing the Weird Bubbles in the background and what they do for the whole chapter thus far. What seems to be going on now is just paying that off.