Press the flag and watch. Brown cat is Briarclaw, the Darkforest told her to kill Crowheart whos her mate. She did it thinking she had no choice. She has a cut over one eye from the fight that's still bleeding. Right, when it was too late she stopped attacking him horrified by what she'd done and when he fades her heart breaks. The black cat with stars (the white dots) is Crowheart who was killed by his mate Briarclaw. He loves her still but is disappointed. The red on his neck is where Briarclaw killed him. He can't forgive her but still feels his heartache to see her heartbroken.
The song is too late to apologize by Timbaland, I thought it matched this pretty well. Credit to @GlitchedWolf for the line art! The blackish text more to the right means Crowhearts talking while the reddish brown that's on the left means Biarclaw is taling.