Either Ralph will get severely injured or die. Spears are usually a sharp weapon that is made for throwing. Using that and the idea that Jack and his comrades are throwing spears at Ralph will most likely end up as a major injury for Ralph, or even death.
“Nano” is the metric prefix for 1 x 10-9, so a nanometer (nm) is a billionth of a meter. It comes from an ancient Greek word that means “dwarf.” Nanoparticles range from 1 to 100 nm in diameter.