Can 'Internet connection lost' on any pertucilar device trigger an online device under the same account

Is there a chance you could, for example:

If one of my ZigBee Bridge’s internet status turns to ‘offline’ under my home account,

Could an online device under my same home trigger an online device?

It sounds like the trigger needs built into the online ZigBee Bridge’s features to realise one of the bridges has gone offline as it’s the one that needs internet to know this.

Hope that makes sense.

I want to use this as a backup trigger for an alarm. The online ZigBee needs its own separate WiFi to have a backup internet connection… So you have cross home triggers?