The reason for the red flag will be because Zhou was in the firing line of anyone going off at turn one. Even at low speeds it could be fatal if someone went off into his stationary car or the recovery vehicle.

Exactly, in the Bianchi-incident Sutil was very very lucky that he didn’t get killed.

They did exactly what they’ve done before. Reset positions per the last available sector timings.

It would be minimal risk–honestly not that different than dry conditions. Double yellows in that sector would mean cars are just creeping through.