Sophie totally meant to do that! She's called Springer, after all!
Sophie's body can best be described as rubbery, having high mechanical elasticity and limited ability to extend or reshape compared to many other Bendies. While still beyond the limits of any normal human, by Bendy standards, she could be considered rather "stiff" or "tight". This means she cannot extend very far, and her limbs become very tapered and thin when extended to their limits, making it harder for her to keep her balance at the extremes of her stretching ability. However, the trade-off is that she has a very firm and springy texture, allowing her to rebound energetically from impact, instead of spreading out into a mushy pancake on impact like a looser-bodied Bendy might. If Sophie can learn to harness this kinetic elasticity, she might be able to unlock many extremely useful movement options! But for now, it's more often a source of awkwardness and embarrassment than anything else, since she's still clumsy with her new body. Holly calling her "bouncy-butt" isn't helping her confidence either....
I've been meaning to do something like this for literally 4 years, ever since I first revealed the current version of Sophie in 2020. The tricky thing with illustrating Sophie's powers is that since they are kinetic, one drawing usually won't convey it effectively, so I would need multiple drawings to show her bouncing in an ideal way. But with the limited time I have to give to drawing and my desire to focus on writing when I do get creative time, this has been difficult for me to do previously. This piece took a long time, but for Sophtember, I wanted to do at least this one, a big high-effort piece to really show how her powers work exactly as I see them in my head, like the Phoebe building-wrap from last year, so here you go! One unexpected thing I had to deal with was her hair - I haven't drawn hair in motion very often, and Sophie's hair is very thin and floppy, so this presents a challenge, but I think I got the idea across!