Ok I’m still confused: the ball hit de Ligt”s arm when he fell, that’s not intentional is it.
A free kick or penalty will be awarded if:
the ball goes into the goal after touching an attacker's hand or arm.
a player wins ball possession after it comes off their hand or arm and then scores, or creates a goalscoring chance.
the ball touches a player's hand/arm which has made their silhouette unnaturally bigger.
the ball touches a player's hand/arm when it's raised above their shoulder.
There will be no penalty if:
the ball touches a player's hand/arm immediately from their own head/body/foot or the head/body/foot of another player.
the ball touches a player's hand/arm close to their body and has not made their silhouette unnaturally bigger.
a player is falling and the ball touches their hand/arm when it is between their body and the ground (but not extended to make the body bigger).
additionally, should the goalkeeper attempt to clear a ball from a teammate but fails, the goalkeeper is allowed to handle the ball.