Extending somewhat on what Nigel has skirted.......in that due to the extreme vibrations, no call was possible....!!
Years ago [seems like yesterday].....I can remember a crew that had a Rotor Brake Quill on a B412 let go.
The vibration was so great that their Headsets "flew" off their heads....hence no Intercom or Radio available........great, right when you need both.
Perhaps a helmet thread .........who's game???