'When they attack I am already standing behind them'
you can get behind them by going through them. i have practiced with folks whose training involved staying on the line and taking the center as well as folks who always getting off line. i found that folks who trained to stay on the line didn't have problem getting off line; that's just another option for them. however, folks who always trained with getting off the line, had a hard time stay on the line when required, i.e. put them on a log bridge exercise.