During the scene at the Charlie Chaplin show in Joker, right before the scene in the toilets, Mr. Wayne is collected by a man holding a flashlight.
Why is this? Why is he being summoned for what appears to be his own toilet break? And why does the man have a flashlight?
In a high end movie theatre, orchestra, opera, music, or concert hall, the ushers and security carry small flashlights. It is customary for the ushers to escort a patron to and from their seats if they have to enter or exit the darkened performance hall during the show. Although, the lights on stage or on the screen are significant. The aisles and stairs (normally concrete or carpeted concrete) are very dark. They are normally in the shadow of the seats. And, cellphone usage is usually prohibited.
I worked in venues like these through high school and university. You kept alert for patrons trying to make their way through the dark. You remained ready at the moment so that you could prevent an accident which could, at best, interrupt the performance for other patrons, and at worst, cause an injury. Not only was this a hazard for the patrons, it was a hazard for the venue which could be held liable for injuries.
I think you misunderstood this scene:
The script describes him as being escorted by a bodyguard, presumably because he said that he needed to go to the restroom.
Arthur's really enjoying the movie, almost forgetting for a moment why he's there, when he glances over to Thomas Wayne's box and sees him leaving, being led by his BODYGUARD—
Arthur's eyes go wide and he quickly turns to go, behind him on screen, the Tramp is rescued by the girl before he falls off the edge, orchestra swelling—
There are several mentions of how dark it is, so the bodyguard evidently has a torch to help Mr Wayne to pick out the stairs, avoid tripping, etc.
