Tintin: We failed.
Captain Haddock: Failed. There are plenty of others willing to call you a failure. A fool. A loser. A hopeless souse. Don't you ever say it of yourself. You send out the wrong signal, that is what people pick up. Don't you understand? You care about something, you fight for it. You hit a wall, you push through it. There's something you need to know about failure, Tintin. You can never let it defeat you.
In Bagghar, Allan knocks out Haddock by hitting him on the head from behind. Later, Haddock tells Tintin it was Allan who knocked him out - how would he have seen him?