Great Thief drawing - that's an early one judging from the style - I think all the Thief animations in that scene were early tests, done without any story in mind. Most of them were cut out of the workprint, but resurfaced in the Calvert cuts.
That scene was a MESS to edit in my version, because Calvert had rewritten the scene entirely for some reason. His version being twice as long. So I had a dialogue scene where people were doing the exact same things, but with very different dialogue and crap animation - plus about a minute of random original Williams animation that wasn't in the workprint .... and the scene is nonsensically edited in any version you watch. I didn't quite make it all fit together ...