The edge case would be a someone using these techniques on, say, an attractive woman three seats down on the train. In addition, one (hypothetically) could use

The edge case would be a someone using these techniques on, say, an attractive woman three seats down on the train. In addition, one (hypothetically) could use iOS state awareness in conjunction with other attack vectors to gain access: i.e., we have an attack vector to gain remote access, but it only works if the target device is unlocked.