Q: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Passage: A previously undefeated fairground boxer named "One Round" Jack Sander is beaten in the ring by a mysterious challenger, who is later revealed to be Australian Heavyweight champion Bob Corby. Bob's manager is impressed with Jack's performance and offers him the chance to become Bob's full-time sparring partner, on the condition that he win a trial fight to be arranged at a later date.
Bob begins spending more time with Jack's girlfriend Mabel and buys a bracelet for her to express his feelings. The two kiss but Mabel reluctantly puts a stop to it. The next day when Jack inquires about the bracelet Mabel lies to Jack, telling him that Bob bought it for her because he didn't want to take the money.
Jack wins his trial fight and is made Bob's official sparring partner. Keeping his earlier promise to Mabel, he agrees to marry her the next day. Mabel goes through with the wedding, although somewhat reluctantly due to her new-found feelings for Bob. At the wedding reception Bob jokingly states that he wishes Mabel had been the prize at his and Jack's original fight. Jack boldly states that he would defend his wife in a fight against any man. A friendly exhibition match is arranged between the two fighters which Bob wins. After the fight Jack sees his bride flirting with Bob and suspects that they are having an affair. Jack declares his intent to fight Bob for the heavyweight championship, but is told he is not yet ranked high enough in the league to challenge Bob. Training intensively, Jack works his way up the rankings and eventually becomes the number one contender.
A:
Who does the heavyweight champion flirt with after his win?