As the Public Talk and WT study was considered a public meeting, Df'ing and other private congregation announcements were normally reserved for the weeknight Service Meeting
Incognito ...
Yes, I never recall a DF or Probation/Reproof announcement on a Sunday, only the mid-week (Thursday night meeting). Mentioning that someone was doing, as Simon said, "sheep-shagging", at the Sunday public meeting would have brought reproach on the organization.
Rub a Dub