IvoYarido on 01 October 2009
Its a random glitch that occurs when you hit a bomb and it both is shielded and connects. The effect of the bomb going off freaks out and the hitbox doesn't disappear like it should so you've got this invisible wall of bombness you can run in to. Completely random I think as I haven't been able to replicate it more then once.
I think to get it to go away you have to be lucky and hit the spot where the original bomb went off before it makes its wierd vertical wall.
Oh, and wee for the range of the quake effect of Dedede's Fsmash in Brawl+
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