What should I do, as I hastened to bow to a man who passed in front of me during prayer, and my intention was to bow to him?

The prayer is valid if the worshiper completes the recitation of Al-Fatiha and then hastens to bow (rukūʿ) to prevent someone from passing in front of him. Hastening the bowing for this purpose does not invalidate the prayer. Furthermore, according to the majority of scholars, the prayer is not invalidated by anything passing in front of the worshiper.