Why did Rabbi Kanievsky Shlit’a Urgently call 10 People into His Room?

David Zer, the photographer who captured this footage, relates the following:
 
“As usual, I was privileged to enter the holy home of Rabbi Chaim Kanievsky Shlit’a. While I was waiting in the next room, one of the members of the house announced ‘The Rabbi has asked for a minyan.’ I asked, what was going on?
 
“When I entered his room, they answered me, ‘The rabbi has completed the tractate Avoda Zara, Bavli and Yerushalmi, and therefore he needs a Minyan’. I was privileged to participate in this rare moment, and record it. To see the Rav Shlit’a complete a Tractate of Talmud say the Kaddish, taste the wine – and immediately begin the next Tractate.”