Text: Sher-Mandal, the octagonal tower due south of the mosque, served as the General's pleasure-palace, but it was to be the death of his rival and successor, Humayun .
Entailment: Humayun died at the octagonal tower Sher-Mandal.
Contradiction: The Sher-Mandal is a round tower that served as Humayun's secret hideout.