The Castafiore Emerald: Part 1 - S3-E7
Continuity mistake: After Haddock tells the gypsies that they can camp near Marlinspike Hall, Tintin and Haddock return to the manor. As they walk up the stairs, Haddock has his cane in his left hand, but when they walk through the door, Haddock suddenly has his cane in his right hand. (00:03:35)
Chosen answer: If Hector was seriously intent on removing King Ottokar's scepter from the glass cage holding it and launching it through the window with the camera, then Hector would have been forced to knock out the two guards so they would not have interfered with Hector's plan as soon as he removed the scepter from the glass. As for Hector, himself, was explained when Tintin was explaining how Hector stole the scepter. Tintin placed a twig inside the camera and it launched out of the camera. Hector would have placed the scepter inside of the camera, and would have been knocked unconscious due to the spring effect created when the scepter had been launched.
Casual Person