First of all, I really, really, really think that Sentinels and third person takedowns should be available in free roam and once you've completed the story. Maybe make it where when you're in 3rd level alert with the drones chasing after you sentinels appeare too, or they make a 4th level of alert where you get chased over the city by sentinels, and third person takedowns will add some consistency to the free roam combat. Who else thinks this is a good idea??