Johnny Herbert says he has difficulty understanding Lewis Hamilton‘s recent form collapsed as his move to Mercedes in F1 is coming to an end.

Hamilton, a seven-time world champion, had a miserable weekend at the Sao Paulo Grand Prix, finishing 11th in the sprint and scoring just one point in 10th during Sunday’s chaotic and rainy race. On the other hand, his teammate at Mercedes George Russell qualified second, led the early stages and finished fourth.