They could be chanting “VIGANO!”. I scrubbed the audio a little and slowed it down. I am hearing “ITALO!” There was a bishop there, Lucca Italo Castellani. Still, it is hard to tell exactly. Here is some cleaned up audio, full speed and then .7 speed. You decide.
There’s a story at Il Foglio that they are chanting “ITALO!”
Here is the video of today’s Wednesday General Audience, 29 August.
You tell me what they are chanting at the end of the audience coverage: 1:04:30