How big and bright would a lamp have needed to be to be visible to the arena staff under those circumstances?
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the arena staff ... just had to trust that the roboteer was looking after himself properlyIm sorry, I dont agree. The arena staff dont have to assume the roboteer isnt being daft through adrenaline - - they have to insist they SEE the link before allowing him to proceed. And insist loudly if need be!

What all events need is an officious, anal-retentive safety officer who has the presence of mind to yell LINKS OUT!!! as roboteers approach their machines.