They were breaking the flag code. It states during the national anthem, stand at attention, hand at the heart, etc. But what was fascinating to me as a vexillologist is that I didn't see anyone getting upset when something like this happens.
Quebrantaron el Código de la bandera, que dice que durante el himno nacional hay que estar de pie, con la mano en el corazón, etc. Pero lo que me fascina, como vexilólogo, es que nadie se molesta cuando ocurren cosas como esta.