IMHO, most flury of punches or Wing Chun straight blasts, are directly to the front. Get off the line and keep your distance, Ma-ai. Tenkan to the side or rear and take their balance. Or, if staying in front, blend with the punches with soft rolling blocks and redirect them across their own body's centerline until you can pin the arms (Wing Chun Phong-Sau)and take their balance with Irimi-nage. Or, if quick enough, intercept and deflect one punch as you enter and take their balance Irimi-nage.