What personal and professional types of retaliation does Borden demonstrate against Angier in Section 9, Part 4?

Borden demonstrates personal retaliation against Angier by informing Angier's girlfriend, Oliva Svenson, that Angier was cheeting on her with a woman named Sheila MacPherson. Over the next year, Angier simply records, "Another Borden incident" in his journal; the final of these incidents consists of Borden lowering an advertisement in the middle of Angier's performance.