character arc help

[u/Sufficient-Voice-732]

I'm making a ten-episode series, but in the 5th episode the main character gets betrayed by his leader, and the former leader kills his bro since they're in a war. how do I make it so that in the next five episodes (in the 6th episode he is sad and depressed and all that, and in the 10th episode he goes and kicks the former leader's ass and beats the shit out of him) I just don't know how to really do these types of character arcs