The narrator said: I do not know but that he said: He made a sign with his finger. This is the version reported by Qutaybah.
In-book : Book 2, Hadith 536
English translation : Book 3, Hadith 925
2. Prayer (Kitab Al-Salat)
باب رَدِّ السَّلاَمِ فِي الصَّلاَةِ