Submit when Offline

I've written an application that for 99.9% of the time will be online, and so have not used any offline form functionality.
However if I've a user accessing the application whilst travelling, lets say on a train, and he's using a table to access via his 4g ... what would happen if he happens to go under a long tunnel, lose 4g and then hit submit ?

I've tried to test this by creating a simple two step process model. The steps defined as follows, and are activity chained:

a!localVariables(

   local!xxx,
   local!dateTime,

{
a!textField(
value:local!xxx,
saveInto:local!xxx
),

a!dateTimeField(
value:now(),
saveInto: a!save(local!dateTime,now())
),
a!buttonArrayLayout(
buttons: {
a!buttonWidget(
label: "Submit",
style: "NORMAL",
saveInto:{

a!save(ri!xxx,local!xxx),
a!save(ri!dateTime,local!dateTime)
},
submit:true()
)
},
align: "START"
)
}
)

and the second form the same, just with readonly set to true.

In my test, when I fill in the first form and then unplug my network cable hit submit i get the 3/4 progress bar. But after 5 mins i plug back in, then the form continues to stay at form1. 

I was under the impression that the submit would be queued .... he's see the progress bar travel to about 3/4 full and then pause. When he then emerges from his tunnel and the 4g reconnects then the submit will continue and whatever actions would be followed ?