If I walk into my subordinate's office right now and say "Have you finished that graph yet?" then that communicates that I'm really impatient about getting that graph. Which would be fine if I am, but I'm not. If I do that, I'll just make him jumpy and anxious.
Instead I'll wander down to his office and start with a "Hey, how's it going?" before asking about the graph, cuz I'm not actually impatient to get it, I'm just interested to know whether he's making progress or whether there's anything I need to help him with. The smalltalk is basically just equivalent to "I come in peace".
If I were a gorilla I'd probably have to do this with gestures and facial expressions, but since I'm a human I have this extra tool in my arsenal to communicate the non-threatening nature of my approach. Awesome!