That'd be very iffy.<br/>You'd have to achieve a few objectives:<br/>1.  Make the walkway in a condition where it would collapse when you want it to.<br/>2.  Make other people not walk across it before Udi shows up.<br/>3.  Not have it collapse under Udi's feet (unless you want her to die, in which case skip 3)<br/>4.  If 3 was skipped, have it collapse under Udi's feet.<br/>5.  Make it seem intact so Udi doesn't just avoid it before she gets on it or to the point where you want her to be when it collapses.<br/><br/>Never mind you'd have to have tools to sabotage the walkway, and you'd have to do this without drawing any attention.<br/><br/>Lot of failure points.