Which phrase in this excerpt from "An Occurrence at Owl Creek Bridge" uses a simile?

He was not conscious of an effort, but a sharp pain in his wrist apprised him that he was trying to free his hands . He gave the struggle his attention, as an idler might observe the feat of a juggler, without interest in the outcome. What splendid effort!—what magnificent, what superhuman strength! Ah, that was a fine endeavor! Bravo! The cord fell away; his arms parted and floated upward, the hands dimly seen on each side in the growing light . whats the answer