 PLOT: SPOILER: During the climax, Roney climbs up the tower crane  and works his way straight to the very end of the horizontal boon,  and waits, where the load would hang. The foundation of the crane  crumbles by chance, and the crane eventually makes contact with the  phantasm out of pure luck. Roneys weight, being inconsequential  compared to the weight of the crane, combined with the fact Roney is  nowhere near the controls of the crane, means Roney accomplishes  nothing by climbing the crane. It is the influence of the phantasm  on the crane which results in the phantasms destruction.