Job uses these questions to rebuke his friends. Possible meanings are 1) Job is saying that they should fear God. AT: "His majesty should make you afraid, and his dread should fall on you." or 2) Job is saying that they will fear God. AT: "His majesty will make you afraid, and his dread will fall on you!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
Dread falling on people represents them becoming terribly afraid. AT: "and you not be terribly afraid" or "and you not be terrified" (See: [[rc://en/ta/man/translate/figs-metaphor]])