You cannot seize the initiative by discarding a second action card. (This doesn't limit other ways to seize.)
Instead, you may seize the initiative when playing a card if you choose to Provoke Outrage with a non-Outraged resource. (Discard resources and Guild cards of the Outrage type. Place an agent on the matching Outrage slot.)
Remember, you can't seize the initiative if you have it or it has been seized!
Act: 2
A: No. At this point, the relevant card is tucked outside your play area, and this part of the ability is no longer relevant.