dreams are just subconscious messages, it's telling you what is happening in your waking life. It can change stories, events, plots every now and then, depending on your waking life.

chase dreams are very common, it means that there is something that haunts you in your waking life. like clowns for example, do you have fear of clowns? if yes, it may suggest that there is a mysterious person who wants to harm you in a way. in your first dream, you may have confronted the person (in your waking life) but on your second dream, it may suggest that you allow the person to take over you (figuratively).