DJ is smoking pot. But he's a natural trained tennis player, can hit 125 in his sleep.
He doesn't really do the Milos thing we're talking about. Notice his prep position. His racket is perpendicular to the ground. Milo's has the hitting face facing left and upwards, maybe 20 degrees.
DJ forgot about his high elbow, high hitting hand finish, after striking the serve, while the racket is pointing at the ground.
Tanner and Goran would argue about high toss and jumping upwards. They low toss and jump INTO the court, as did Curren, Rusedski, and a few others.