Hermione can feel her bile rise a little when Anders starts cutting, but honestly, it isn't as though she'd expected him to have a tray of sharp objects besides him and a dead dragon with an open chest cavity in front of him and not start cutting into something. She's no surgeon even when it comes to other humans, so she doesn't touch anything, instead forcing herself to look on in the event that she'll learn something interesting.

"Oh, no, it does have a lot of magic," she explains, trying to both watch what he's doing and mentally disengage from the gore of it. "But the average witch or wizard wouldn't necessarily be able to feel it. We can only sense if a large store of magic has recently been used, especially towards a bad end. Dark Magic that leads to widespread death or chaos, for instance, leaves an almost permanent scar on a place. Those who are more fine-tuned to the way magic feels often use their talents towards a specific career, such as wand-making. Dragon heartstring, phoenix feather, and unicorn hair are the three most common cores where I'm from, though it varies greatly depending on the region and on the specific wandmaker."

She would happen to have the core that can't really be gathered with the magical creature in question still being alive. It's unfortunate, and she wonders now - and not for the first time - why her particular wand had chosen her. There are any number of explanations and pieces of lore, but as far as Hermione's been concerned, they're about as reliable as zodiac signs and the like.