"See how flies" is an idiom used to describe observing the outcome or consequences of a situation. There are several synonyms that can be used in place of this phrase, such as "wait and watch", "observe and track", "keep an eye on", and "monitor closely". These phrases imply the need to pay close attention to a situation and to be patient in order to gain a deeper understanding of the results. So instead of saying "see how flies", one can use these alternative phrases to convey the same meaning in a more diverse and concise manner.