One of my destinations in the city has a peculiar access route - I need to descend a very narrow set of steps, a staircase, which has barely enough space to let two pedestrians pass.
I'd estimate its width as 150 cm. It's not as steep as staircases which we use to access higher floors in buildings - its inclination angle is maybe 50%. It's an outdoor set of steps, which connects two streets.
An alternative route exists, but it is longer and is less fun for me.
I have never tried descending there with my MTB, because if a pedestrian tries to ascend the staircase while I am going down, he will probably get scared.
Trying to think from the pedestrian's perspective:
The guy on the MTB doesn't look he is going to stop, and there is absolutely not enough space for him to pass by! So the only way to prevent a crash is to [do something desperate and stupid]!
Objectively, this is nonsense, because I have no problem stopping, and legally and ethically I am obliged to do so. But subjectively, the situation can be very intimidating. I guess that shouting something like "Don't worry, I'll let you pass" will only make it worse.