swordsaint
Smash Master
Could always stuff up though, not everyone is prepared for a SDI backwards.It doesn't have to be tested - it's already known
You can SDI jab locks either behind the person jabbing or further away from them so that they can't reach you for the next hit. You can also SDI towards the edge so that they dont get as many hits on you before they have to end it.
You just need to choose the option most suitable to the circumstances. SDI behind the jab locker usually shouldn't work though, because they can just as easily turn around.