I’m not entirely sure what the Indigo ground staff were trying to achieve by preventing him from getting on the bus. After all, this was an arriving flight and surely detaining a pax on the apron of a live operational airfield is irrational.
If what indigo claim is correct, it appears to be a classic case of “seniors know best”.....and that is something that is real cultural problem in India.
The two guys acted irrationally by following an irrational order and I can only put that down to cultural bias.