Expert Mode Grappling Hooks

These grappling hooks solve the need for rapid vertical or horizontal movement in rough terrain. By crafting together an ender pearl, fishing hook, and iron block, you've managed to create reliable short range teleportation. This item can be enchanted, however Unbreaking III and Mending are the only meaningful enchantments, as this item is not meant to be used for fishing.

Usage
Cast once to throw out your iron block a short distance away. Once the block has hooked onto terrain, it will spin to face you. Re-casting the grappling hook will teleport you to your destination. If you would like to cancel teleportation, crouch and re-cast instead, to pull back in the iron block. Any time spent crouching once the iron block has landed, will cancel teleportation.

While not advised, you may switch away from the grappling hook during the cast phase, if it has not landed. Doing so after the iron block has landed, will cause the player to teleport immediately. While not intended behavior, you can just as easily crouch to pull in the grappling hook if you wanted to cancel.