I recommend contacting the Double Agent (a.k.a. DA) under 3 situations:
- Do it first, before the Sniper has a chance to get her bearings.
- Do it last, so the Sniper's desire for "bookkeeping" keeps it occupied during the 10-second countdown to victory.
- Do it when every single person is in a conversation. Difficult on Ballroom, easy on Balcony, nearly impossible on Veranda, and difficult on Courtyard.
The third item is a good piece of advice whenever you want to do a Banana Bread (BB), but it is separate because sometimes an opportunity opens up which is too good to pass up, like if the DA walks up to you while you are in a conversation and everyone is in a conversation. If you note that the Sniper is doing this often, then try to do a perfect "fake BB", and walk away immediately after doing it so you get low-lighted.