By 1981, Paul Di'Anno was demonstrating increasingly self-destructive behaviour, particularly due to his drug usage, about which Di'Anno comments, "it wasn't just that I was snorting a bit of coke, though; I was just going for it non-stop, 24 hours a day, every day ... the band had commitments piling up that went on for months, years, and I just couldn't see my way to the end of it. I knew I'd never last the whole tour. It was too much." With his performances waning, Di'Anno was immediately dismissed following the Killer World Tour, at which point the band had already selected his replacement.