Maneggs Mario Nightmare

What is wrong with me that I find this so amusing?  This artist, maneggs, does some really disturbing but funny stuff.  I’d like to say I understand it all, but the horse one (one or two before the one you see above) flummoxes me.  This above, this is just a masterpiece.  Though I don’t know why Toad would care if Mario killed a Koopa.  Enlighten me?

image VIA maneggs