quote from Combovid: http://combovid.com/?p=1450
"512 Special and 512 Guard
In WW there is a 1-in-512 chance of a random button press doing a special move. This can cause a charge move to happen without a charge, but can’t be used to cancel a normal. There is a also a 1-in-512 chance of a move being automatically blocked without the player holding back. This is probably not a glitch.