Working at height — fall from height
A defence-in-depth bowtie with an escalation factor — a preventative barrier is degraded by a named condition, which is itself controlled by an escalation-factor barrier dropping below the line.
For the safety officer documenting a working-at-height permit
What this shows
Two threats, two consequences, multi-barrier chains — and an escalation factor, the element that makes a bowtie an honest defence-in-depth model rather than a wish list. The "Temporary edge protection" barrier is degraded by a specific named condition ("Edge protection not inspected", amber), which drops vertically below the barrier on a muted degrades connector. That escalation factor is itself controlled by an escalation-factor barrier ("Pre-use inspection regime") one level deeper.
Reading order along each line is declaration order: the first barrier is the outermost (first line of defence, nearest the threat); the last is the innermost (nearest the knot). The escalation hangs into the whitespace below without disturbing the symmetry of the two threat lines.