What pros do in last 10 seconds of byoyomi

1s: Think

2s: Think

3s: Think

4s: Think

5s: Think

6s: Think

7s: Think

8s: Think

9s: Puts hand to stone. Continues to think

9.2s: Grabs stone. Continues to think

9.5s: Checking whether the reading is correct

9.7s: One last thinking

9.8s: Plays stone on the board