Underwater battles (The Witcher 3: Wild Hunt)

Underwater drowned people oneshot, under water, naturally. I was attacked by a bandit 10 lvl higher. He led him to the water, slinked up the mound, the bandit did not move at that time and calmly fired at him with "repulsive" arrows from a crossbow. A minute later, with the "help" of my arrows, the enemy went deeper and deeper under the water. When the unfortunate bandit stuffed with arrows found himself completely under water at a depth of about two heights. I dived under the water, with the hope that I would have a "sweet" one-shot in a pumped bandit. BUT alas. ONESHOT ONLY IN UNDERWATER DROPS.