When the most wretched of them got up
They followed the worst among them
when the most wicked of them broke forth
When the basest of them broke forth with mischief -
When/if its most miserable/unhappy stirred up/urged
When the most wicked person among them went to kill the she camel (that they themselves had asked as a miracle.
When the most wicked among them stood up in defiance
When the most wretched among them got up
When the most wretched of them stood up
(It was) when the wretched-most among them arose
When the most wicked man among them went forth (to kill the she-camel)