Guitar player DO f)(&ck up on stage! There can be many reasons: Broken strings, bad cable connections, drunkenness, losing a pick, noise in the monitor, strange thoughts in your head, hearing problems, bad vision etc.
These things happen.
My guess is that Keith often not looks at the fretboard while he is playing. The BS-riff starts high up on the fretboard, so maybe the posing and interaction with the audience goes on behalf of a few bars...
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