Those aren't "random people". They're literally in military uniform. What are the ones next to him supposed to do about it? Make a big fuss and cancel the parade over a common occurrence? In fact, this happens quite commonly across the world.
When I sung in a choir in primary school. we were literally told if someone faints in front of us during a performance, to ignore it and keep singing. We thought it was an over-exaggeration. Until the Christmas concert when someone literally fainted in front of us during it and we kept singing. Of course, the teachers then came and rushed to their aid and carefully brought them away. So during organised performances like this- it's quite standard not to freak out if somebody faints.