Which is correct and why?Tu es descendu l'escalier vite.Tu as descendu l'escalier vite. I know to use être on passé composé with descendre normally, and avoir when there is a direct object and the meaning is took down. To me in this sentence we are not saying he took down the stairs ( not in the same way you would take down a case of wine to a cellar perhaps) but rather that he was descending and the place where that was happening was the stairs. The book I have says to use as with this example, but it seems strange to me.