Let me show you a special feature on him. Observe this large disk on the base of his grip.
Imagine swinging the sword. The disk will hurt your wrist. Therefore: you must not bend the wrist. The disk keeps hand straight.
Tulwar is used with straight wrist at close range. Instead of bending wrist, you use the force of your shoulders and upper body and pull the sword across your enemies. Here are some quotes from 19th century:
"It would be, indeed, ridiculous to match the cutting power of the ordinary sabre against the tulwar, which produces, in the hands of men inferior in stature and bodily strength to our soldiers, effects of which strike the beholder with astonishment. These effects are partly due to the curved shape and keep edge of the tulwar, and partly to the way of using it... keeping the elbow and wrist stiff, and making a sweep with the weapon, throwin the whole force of the body into the blow, the swordsman gives what may be called a "slicing" cut. This cut, well delivered, will take off the head or leg of a man."
-The Saturday Review, December 20, 1862
"The tulwar or sword of the enemy has a broader back, thicker blade, and keener edge than ours; and the enemy are in the habit of delivering the drawing cut, a most cutting kind of blow. Whilst Unett was charging on our left flank, a Seikh cut at him from behind. A private dragoon close behind his gallant leader, interposed his sword; the Seikh's tulwar not only shivered it to pieces, but penetrating Unett's pouch, entered his back."
-Colburn's United Service Magazine, September 1850
Traditional use of tulwar, usually in conjunction with small shield.