This speaks of entering an argument quickly as if the argument were something the fool physically jumped into. AT: "every fool quickly gets into an argument" or "every fool is quick to join an argument" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This means that there will be nothing growing in his field for him to harvest. AT: "but will have nothing to harvest" (See: [[rc://en/ta/man/translate/figs-explicit]])