Tactical knowledge is the most important skill for every swordsman. If you use it, you\'ll prepare yourself for the fight (consider your moves, tactics, offense and defense). The skill itself gives you a small bonuses to your stats, but more important is, that it is needed for many other skills you know (such as finesses). The best thing is to use it before the combat. But sometimes it could happen that you forget your tactical knowledge during the fight. You can try to regain it also during the fight, but the cost is very dangerous. If you try to regain your tactical knowledge during the fight, it will cost you MUCH MORE energy and there is a high chance that you will fail.