 CONT: When Mr. Salt walks in front of Wonka to go down to fetch  Veruca it would not be possible because as the gate swings open it  would be in Mr. Salts way. As Wonka unlocks the gate you can see  Wonkas hand opening the gate slowly and in the next scene you can  hear the gate still opening, so Wonka would still have his hand on  the gate which totally blocks Mr Salts path.