In black : Michael
In purple : Denis
A : Denis do not brake fully on one turn, or brake less that him : i do not use the potential of the car.
B : Denis generate less G force and get less traction on the front wheels
C : Denis brake sooner
D : Worst, Denis release the brake while braking, see the pattern on several braking (*)
E : Denis had to put some before the apex because my braking was bad