A fuse is a contraption that can connect a lighter element to a flammable/combustible element. A well-known fuse is C-4, and a very basic diagram of a fuse is magma/fire-C-4-Nitro. The magma/fire ignites the C-4, and when the exploding C-4 reaches the nitro, it will explode, too. Most fuses can be set off with any lighter element. Bomb cannot be used to ignite a fuse, as it cannot set off any basic fuse to explode.