Trap Bolt

A form of ammunition for the Crossbow which can be bought, found or created at a U-Invent machine. Aside from their direct use as a bolt, they can also be fired into stationary objects. After a moment to allow the player to move, a cable is launched from the bolt backwards from it's point of origin, attaching to any available surface, forming an electrified perimiter.

Uses
The Trap Bolt can be used primarily for setting traps for wandering enemies, although this isn't advisable when a Big Daddy is nearby, as it will probably blunder into it, then turn their attention to grinding your face into the ground. Nevertheless, it provides a powerful, one-shot puch of electricity that can take down all but the most determined Splicer.

It also has secondary uses as a direct weapon - however - the bolts may still deploy after hitting the enemy, causing secondary damage to itself or other Splicers who may be nearby.

It seems to be possible to Electrify water with the Trap Bolt, but redundant, considering that you gain the Electrobolt Plasmid at the beginning of the game, a much cheaper means of causing water-based shocks.

Deployed Bolts can also be manipulated with the Telekinesis Plasmid and repositioned, or thrown at Splicers.