But when the biggest calamity will come.
Then, when the great blow comes
But when the Great Catastrophe comes
So when the great Calamity comes
So if/when the Calamity/Greatest Disaster/Resurrection Day the greatest came
Now be mindful of the day that the great disaster that has to come
So when the greatest universal disaster arrives
But when the great calamity comes
Then, whilst (the universe) attains (to its acme through evolution), there will befall the great all-encompassing calamity (the Hour of Resurrection)
Behold! when that great calamity comes to pass
But when there comes the greatest catastrophe (i.e. the Day of Recompense, etc.)
Therefore, there will come the awesome and overwhelming event.
When the greatest calamity comes along,
Then, when the great, overwhelming event comes to pass —
But when the overwhelming calamity (the experience of death) begins,
"But when the great disaster comes,"
But when the great calamity comes
Then when the calamitous eventful event comes to pass
So when the great predominating calamity comes,