But really - there was no need for the snappiness.
Probably sick to death of simpletons questioning him about his own JOB!!
How many times do you see a train with automatic doors arrive into the platform, only for some air head to being jabbing frantically at the External Door button, even when the unit is still moving and then shrugging & whinging until low and behold, *Psst*, The door controls engerisie and the doors "Fiiiiinally" open (with the first press!).

A Person may be smart, but People are stupid.
This is why i simply adore my job. Broken
DMUs▸ /
HSTs▸ do not (usually) argue back.