Inspired by the TMNT animated movie of 2007: Leonardo left his brothers to train alone in a forest in the middle of nowhere, and when he didn't say anything and stayed one extra year Rapahel didn't take it well. He became a vigilante to fight the crime and when Leonardo came back the hothead didn't look like he missed the leader much. This tension exploded when Leonardo finds out his brother is a vigilante and they fought on a rooftoop. Raphael defeated the brother but when he realizes how close he went to kill him he just escaped, leaving the upset leader facing alone suddenly arrived enemies. I adored that moment of the movie, so moving. Raphael showed he loved the brother so much after this.
For more about TMNT look in my gallery folder.

I don't own TMNT, just my art.