This really needs to be sorted out. I think this article confuses Blast Shield with Sealed Door, but someone should do some double-checking. I'm putting some Blast Shield pictures here that I took off of Red Blast Shield, because they were only normal Blast Shields.
Yeah, this article is definitely combining the two. I'd say Blast Shields are the kind that turn into a normal door after you hit them with a special weapon, and Sealed Doors are the ones that you can't open until you do something like kill a boss. -- Spudwalt 04:42, August 14, 2010 (UTC)
The thing is, the games alternate which term they use for what. They DO call the never-open doors blast shields sometimes, but they also refer to missile doors as blast shields, and... Dazuro 04:46, August 14, 2010 (UTC)