"Motorbreath" was written by Hetfield during his time in Leather Charm and tells about life on the road. The song is based on a four-chord verse and a stop-and-start chorus. The most recognizable parts are Ulrich's drum rolls in each chorus and the riff that accompanies Hammett's solos. Because of its speed, the song requires fast picking by the bassist. "Jump in the Fire" was originally written by Mustaine, with lyrics about teenage sexual experience. Hetfield's revised lyrics for the album were written from Satan's point of view, describing how the devil watches people killing each other, and is sure they will go to hell for their actions. "Jump in the Fire" was released as a single in the UK in February 1984 to promote a UK tour with Venom. The single featured "Phantom Lord" and "Seek & Destroy" as live tracks, although they are actually studio recordings with fake crowd noise dubbed over them. The single's cover art features an oil painting titled "The Devils of D-Day", created by artist Les Edwards in 1978.