Ivan
Black Belt
Gripping the blade was indeed common practice. It allowed you to strike with the pommel and hand guards, utilising them as a blunt weapon. This was better used for armoured enemies as blunted weapons were more effective than attempting to cut through their steel armour.There is definitely a technique to gripping a blade
It works well if you know how to do it and does require a certain amount of grip strength and non-sweaty hands
You would also use the lower end of the cutting edge to strike down on an enemy’s shoulder, using the added momentum from the weight being at the opposite end of the sword you were holding from the blade, to cleave through their flesh. This was called a reverse grip I believe?