I did see that Lando blamed Vettal more than Grosjean post session. Apparently Vettal broke the unwritten rule of not passing on the last turn before starting a lap.
Grosjean was then forced to slow down to make a gap for his fast lap or waste it. That took him from being clear of Lando to being in his way, a matter of 2 seconds and no time for the team to adjust and warn him
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