It’s a claw. Very tiny – smaller than a shrimp’s. Whatever it’s from must be somewhere in the slime, but that doesn’t tell you much on its own. Anything with claws this small could be swimming around anywhere and would be barely noticeable if you weren’t watching for it.
No, you find the little drop of blood on it far more informative. You can’t tell the difference between human blood, dog blood and lizard blood, but you do know that stuff’s all much thicker – and usually redder – than insect blood. And it suggests that whatever’s in the slime is going to need more treatment than just being pulled out.
Which means you probably don’t have time to run off and get better tools. Still, the wood is good enough for digging through the slime.
The first plan you come up with is to rip the bandage off, so to speak. Get whatever it is out of the slime, fast, so even if the slime wounds it more on the way out, it doesn’t have much time to do damage.
That has its risks, but you’re not sure you have much time to think of something better. Still, might as well use what time you can spare. If nothing else, it would be nice if you could figure out a way to protect yourself from the pain as you free the captive.