Shared Stratagem Feat 2InvestigatorSource Advanced Player's Guide pg. 61
The plans you make include your allies as well as yourself. When you hit a creature with an attack on which you substituted your attack roll due to
Devising a Stratagem, designate one ally. The creature you hit is
flat-footed to that ally on the next attack the designated ally makes against that creature before the start of your next turn.
Shared Stratagem Leads To...
Didactic Strike