A Tajiquan practitioner against someone of a style such as Krav Maga..... Like all styles, you can't say one is better than the other, or one is completely useless and the other, a perfect form. It depends upon the practitioner and what your original goal in learning martial arts was. If you learned the martial arts just to learn how to fight, most likely you use your rage and anger to fuel your strength behind each blow. But If it was just for the mere excercise or for health, most likely you'll be at more peace when it comes down to the messy stuff. If you have no choice but to engage in hand-to-hand, remember that most likely that person attacked you without any knowledge of your skills, so use those skills to help and not harm. I've always found that grabbing the wrist after someone has swung and a simple wrist bend can calm anyone down. But to truly calm someone down, you have to be smart in your choice of words and your tone. Tell them your not looking for a fight and try to make them a friend instead of a foe.