"One small slip for a man"

When Buzz Aldrin was descending the ladder he had guidance from Neil.
But the first man on the Moon had absolutely no-one to help him do a
very awkward manoeuvre.
So what would have happened if he slipped and cracked his visor?
Please don't take this wrongly - I'm not being ghoulish and I'm
genuinely interested in a situation they must have considered.
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Save the Hubble Space Telescope!
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