Her reasons for leaving were 'obvious'. = It's 'obvious' why she left.
You are stating 'the obvious'. Tell me something I don't already know.
Her doctor immediately noticed the 'obvious' signs of the disease.
(..) However... ...he is not overfond of Dwarves. He's leaving. Come away from there. It's not natural. None of it. It's obvious. He's under some... ...dark spell. Don't be a fool. He's under no enchantment but his own. All right, now get some sleep. All of you. You'll be safe here tonight. (..)2013 The Hobbit: The Desolation of Smaug