U2 found that they were neither prepared nor well-rehearsed, and that their ideas were not evolving into completed songs. The group were unable to reach consensus during their disagreements and felt that they were not making progress. Bono and Lanois, in particular, had an argument that almost came to blows during the writing of "Mysterious Ways". During one tense session, Clayton removed his bass guitar and held it out to Bono, saying, "You tell me what to play and I'll play it. You want to play it yourself? Go ahead." With a sense of going nowhere, the band considered breaking up. Eno visited for a few days, and understanding their attempts to deconstruct the band, he assured them that their progress was better than they thought. By adding unusual effects and sounds, he showed that the Edge's pursuit for new sonic territory was not incompatible with Mullen's and Lanois' "desire to hold on to solid song structures". Ultimately, a breakthrough was achieved with the writing of the song "One". While working on "Sick Puppy"—an early version of "Mysterious Ways"—The Edge played two separate chord progressions sequentially on guitar at Lanois' encouragement, and finding inspiration, the group quickly improvised a new song that became "One". It provided reassurance and validated their long-standing "blank page approach" to writing and recording together.