The verb for the second phrase may be supplied from the first. AT: "The king does not desire any dowry; he desires only that you bring to him 100 foreskins" (See: [[rc://en/ta/man/translate/figs-ellipsis]] and [[rc://en/ta/man/translate/translate-numbers]])
Here "fall" means to die. The phrase "by the hand" is an idiom that tells us the means by which something will happen, in this case, David will be killed by the Philistines. This can be stated in active form. AT: "to have the Philistines kill David" (See: [[rc://en/ta/man/translate/figs-euphemism]] and [[rc://en/ta/man/translate/figs-idiom]] and [[rc://en/ta/man/translate/figs-activepassive]])