You should only convert a noun to a verb when it serves the goals of clarity and precise language. For example, it's much easier to say, "the leader" than say, "the person who led us." But other times, conversion might not work as well. For example, if you're describing an alcoholic, describing the person as a drinker might provide less information than simply referring to him as an alcoholic or saying he likes to drink alcohol. To add on, Many suffixes can be added to verbs to change them to nouns. Examples include adding -er as in runner, adding -tion as in action or adding -ade as in blockade. You might also use -ment as in merriment or -ant as it's used in defendant. Check a dictionary to determine whether the suffix you're adding constitutes a real word. If it doesn't, you'll need to clearly note that you're using a manufactured word or find a way to convey your meaning without converting a verb to a noun.
Marcus is facing conflict from himself, he is fighting himself about what to do.
