Nest Hello and Google Home hub or Mini

Questions & Help
1

When someone pushes my Nest Hello doorbell I get a message on the Google Home Hub and Google Home Mini.

Two questions;

  1. The message “Someone is standing at my frontdoor” starts on the google home hub and a few seconds later on the Google home mini. In what way can this be at the exact same moment, or if it this is not possible only on the Google home hub

  2. I get the message “ Someone is standing at my front door” and my Google Home hub cast the video on the Google home hub. Is it somehow possible to use this as a trigger in a flow. The ‘nice’ persons at Google have not implemented pushing the doorbell as a trigger yet.