My female blood was kept on newspaper, in a tub, by me for a few months since I got her. I put her briefly into a tank with coco fiber. She buried into it, and got really, REALLY NASTY when I went to remove her. She was literally like a different snake; really nasty.

I set her back up into a tub with newspaper last night. Now, I went to remove her, and she is just fine. No S-curve.. nothing.

Maybe the substrate caused it? I have no other explanation. But I am definitely keeping her tubbed on newspaper from now on.