How retarded is this author tho? At least search up the energy of a meteor or something similar to have a somewhat realistic reference of what the energy of the spear should be, like how does he not know just how little 3.6 * 10^2 joules is? That kind of energy is what someone would use to power a fucking toaster for about a whole second. Kinda offputting when an author tries to make parts of their plot somewhat realistic only to have everything they say just blow up in their face about 3 seconds later cause they cant bother to do some basic fact checking. Not to mention, his calculation would have been remotely right if he had just used the formula for kinetic energy, which again, is not fucking hard to find nor use.