There's a tall guy I play against with a huge 1st serve, but a mediocre 2nd serve. When I play him I block the 1st back and commit to attacking his 2nd by moving inside the baseline and ripping the return or doing a drop shot off my backhand. After I beat him a few times doing this he started doing a 1st serve for his 2nd when he saw me moving in and almost knocked the racket out of my hand. How should I adjust to this? Just hope he double faults?