Lewis should have done a Mika and gone through flat chat while holding his hand up. Dont think Mika would get away with that these days. Seriously though although there seemed to be a mis communication between the FIA and marshalls ultimatly if a driver has yellow flags waving in front of him he should slow down in case the green light bby FIA is wrong. The marshalls may still seem something on track that the FIA have missed. e.g debris or a marshall himself. Flags are there right on the scene and should be first in priority.