The abstract noun "mercy" can be stated as an action. See how you translated a similar phrase in [Psalms 123:2](./002.md). Alternate translation: "act mercifully toward us" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
Here humiliation is spoken of as if it were something that could be fill up a person. "we are very disgraced" (See: [[rc://en/ta/man/translate/figs-metaphor]])