Was watching a game on youtube where this situation came up: Reactive trooper is in a 5 man fireteam so has sixth sense. Active trooper is in camouflage marker state and starts the order in the back arc of reactive trooper inside ZoC. Can the first half of the order be discover targeting the reactive trooper for the purpose of breaking camouflage state and forcing a dodge/reset ARO? Marker doesn't appear to be in the requirements section of the discover skill.
And it is an extremely useful tactic! My Fidays frequently peer suspiciously at their victims, just before shotgunning them.