Why wasn't Mordacai more upset at Skips in "Over the top"?

He punched Benson just for talking shit about Rigby, he should've been furious at Skips for murdering him. That's his best friend! Maybe he lashed out at him off screen. Now I wanna see that missing scene of Mordacai really letting Skips have it, not that pitiful "I hope you're happy...".