אִם־שׁ֭וֹט יָמִ֣ית פִּתְאֹ֑ם לְמַסַּ֖ת נְקִיִּ֣ם יִלְעָֽג׃
If the scourge slay suddenly, He will mock at the calamity of the guiltless.
Rashi on Job
If the scourge of the Adversary’s tongue suddenly puts the righteous to death.
Malbim on Job
Perhaps the suffering is a test and the more stoically the victim stands up to it the greater will be his ultimate reward. But what if he dies before it's over?
Rashi on Job
at the calamity of the innocent that he put to death he will mock.