I always thought the appropriate reaction would be shock and curiosity. Don't know many people who would aggresively reject this phenomenon.

You'd be surprised. Emotions can skyrocket the longer somebody has time to cycle through a sequence of what-ifs and prospects for future endeavors. Especially if the concept of changing species out of nowhere never once crossed their minds.

So, the best escape from Adomn would be to grab his fox-turning friend and run away by car. Because he could not move faster then human walks.

What happens if somebody escapes before complete? If the threads are not packed insine him, how it affects person's health?

By nature, the threads retract similar to the power cord of a vacuum cleaner. It's a force similar in concept to gravity; the threads that Adomm pulls are a sort of core to the actual physical shell of the canvas.

At least, that's how I understand it, and when i relay it like that to her, she gives me a subtle nod.

Also, you are correct. Many a canvas had managed to escape from Adomm by fleeing, causing the threads to yank out of her hands and back into their host body unfinished and, in some cases, unstable. Even a full sprint is usually enough to get away. That is why she had to adapt to certain tactics, like changing as much as possible without risking discovery and quickly changing the legs to make the canvas stumble and fall to buy more time.

Like all things, it's an art. You practice, you make mistakes, you discover strategies and patterns, and you get better.

Maybe, there should be a better end for the new fox in this version. At least, his friend could rescue him to a vet. And then care for him as his pet.

Sounds like there's some demand for the sequel. Things get a little... interesting later on.