Many enemies do not match movement and aim.

I was saving my campaign points when I was suddenly killed by a sniper.
The result was three headshots, which was obviously not right, so I looked and saw that the enemy was clearly a novice himself. He walked around with his weapon, holding the sniper in an unobstructed open area, and rarely used his pathfinder ability. His other weapon, a plowr, was also clearly a novice move, and he was only able to hit a few shots with one magazine.
Still, only the longbow was well aimed, hitting more often than missing, with the occasional head shot.
His walking movements were linear and awkward. The enemy appeared to be using some kind of tool.

Another attacked me sliding off a building with an AR-like weapon, killing me before I hit the ground, but half the bullets that hit me were head shots.

The other guy used his R99 to attack me from a different direction from mine, from about 30~40m away while running away from the anti's, and half of the shots were headshots too.

Is this game so full of headshots? I have never been able to attack with so many headshots myself, and even watching videos of skilled players, such cases are rare.
If you know the reason for this case, please let me know.