What is the ruling on a man who catches the supplication of the witr but does not catch the rak'ah?

Question : He was asked about a man who catches the supplication of the witr but does not catch the rak'ah. Does he bow in one rak'ah, or two? And if the imam has completed the witr with three, what does he do?

Answer : If the one who entered with the imam during the qunut supplication intends something other than the witr, then when his imam concludes the prayer, he prays two rak'ahs, because the last rak'ah was missed when the imam rose from its bowing, so he prays two rak'ahs. And if he intends the witr, then if it is the custom of this imam to perform the witr with three, he makes up three, and if it is the custom of the imam to perform the witr with one, he makes up one.