Hell House's AI will fire Bad Plumbing D: at it's back until it's triggered by taking damage from the party. At which point, Bad Plumbing D: switches attack sides and it proceeds to go ham on you. It's morphable, just difficult. Now VICES on the other hand. HUUUURGH. That escape.
Also MORPH BOSSES. Just...don't trust anything. Morph and Steal anything that so much looks at you funny. You know how annoyed I was when I realized I missed the chance to Morph the elevator bosses in Shinra HQ?
P.S. I stream on Hitbox. This is all I stream lately. I'd feel grimy linking, and I tend to have people on Mumble with me, but if you're interested just look up Zartemis on Hitbox. I should start uploading the vids too, though they're not yootoob quality so *shrug*
Edit: To elaborate further on the morphing/stealing thing, and don't read what follows if you want surprises with your item-collecting adventures, Saboteur Grunts give something p.good, Soldier 3rd can morph and be robbed for Mythril Sabers for Cloud, Moth Slashers cough up Carbon Bangles on Morph, a returning friend early on in the Shinra Building gives up Grand Glove, Heavy Grunts have Atomic Scissors from Morph or Steal (can't remember). I know I managed to snag a Mythril Claw for Tifa before the tower too, and the Dex bonus is sexy. Don't know what I missed beyond the elevator boss morphs, but always be on the lookout. Trust nothing, even if one boss doesn't Morph, there is no apparent rhyme or rhythm. SEGA CHIEF IS A MADMAN. SEGA CHIEF FOR PRESIDENT 2015 I DON'T KNOW.