A rather unsafe release of Hamilton by the Merc team indeed.
They should be reprimanded. No question.
The problem is that it would the the 3rd for Hamilton = 10 grid position penalty, whereas he as a driver has no blame.
Imo 'he' should be reprimanded and no doubt a Manor driver would be, but p.e. Ferrari (Alonso) has in the past received protected treatment and I am curious about the status of Mercedes in that ranking.