I figure they should have some invulnerability since without it their purpose is lost, but only up until the point the move hits (maybe one tick into the hitting frame for priority), and be vulnerable after that so that they can be baited and whatnot without being a brainless move you can do every time.
Oh and Pocket Fighter also had this, in its own way.
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Last Edit: January 02, 2009, 07:39:16 am