Darksiders Onlive Marathon of Doom

Played Darksiders ALL DAMN weekend.  Having a effing blast.  Right now I am at the part where you have your new sword forged.  I am looking for all the armor pieces before I progress any further.  And I fear I will only get 9 pieces because there is a platform that I activated and it went up and never came down.  Cannot find a way to get onto it. =/ Fuck it, great game anyway.