This cave is, officially, the absolute worst.
You need to think fast - Geron's hands are occupied, so magic is the only thing we can use here.
Look for anything you can use as a weapon nearby.
The broken knife near Geron.
You'll need to find something that will bring it closer to you - look for anything fragile in your immediate environment.
The icicle above the skeleton.
We got a rib from the skeleton - use it to grab the knife and defend yourself!
Close one - now go save Nuri!