Stardust Crusaders - Chapter 147 
DIO's World, Part 14 (DIOの世界 その⑭ DIO no Sekai Sono 14), originally Confirming Death (死の確認 Shi no Kakunin) in the WSJ release, is the one hundred forty-seventh chapter of Stardust Crusaders and the two hundred sixtieth chapter of the JoJo's Bizarre Adventure manga.
To Jotaro's dismay DIO redirects his attention to the now injured and unconscious Polnareff, which puts Jotaro in a tough position; he can either move and reveal himself to save Polnareff but lose his opportunity to trap DIO, or he can maintain the deception by allowing his beloved friend to die at the hands of the vampire.
He opts to shift his fingers slightly just as DIO is about to decapitate Polnareff. DIO spots this out of the corner of his eye and his fear of Jotaro causes him to jump back, fully guarding himself. Although the lack of movement on Jotaro's part thereafter causes him to doubt the validity of what he saw, rationalizing that it may have been his imagination. To be safe he listens for his breathing and hears nothing. DIO places his ear to the ground to sense Jotaro's heartbeat but Jotaro manages to use Star Platinum to clutch his own heart, causing it to stop and immediately placing Jotaro on the verge of blacking out. He instead decides Jotaro is of greater concern and returns to his original plan of cutting off his head, only to have Star Platinum deliver a powerful strike to the head when he enters Jotaro's range.