By nature, a place has to have an entry and exit point. Escape was inevitable in that case but logistics haven't found Castiel in his addled state. He's not thinking in his typical manner, full of astrophysics and paradoxical equations that needed solving. He's trying to get by, the weight of his own condition and his experiences heavier than ever.

There's no reason to answer the first question, it might as well be rhetorical. Instead, he just nods in the space between them as if that will resolve their distance and their differences. "I'm well aware." There's no point in playing his hand. Death found him long after his fight with Michael, which meant that Michael may not know about their father and his rampant ineptitude and self-absorption. "This place likes to make sure we know the linear rules of our own relative timelines don't matter."