Most hydrogen fires will have the flame characteristic of a torch or jet and will originate at the point where the hydrogen is discharging. 大多数氢的火焰具有火炬或喷射器的特征，起源于氢泄漏点。
Reaper troopers are chemically altered to make them even more aggressive before being subjected to weeks of brutal training in close-quarters combat and the use of their jet packs. 经过化学改造，收割者更加富有侵略性，在此之后，他们要进行残酷的封闭格斗训练与喷射器使用训练。
