According to Sky Germany, the reason why Q2 wasn't red flagged immediately is because Stroll tried to drive the car to the pits for 30-40 seconds

via /u/Dexelele on the bad site

In the replay you can see him restarting the car over and over again and trying to get back on the track. The car even moves back and forth the whole time while he tries to reverse and turn around.

When asked about it in the interview with Sky Germany, Stroll said that he didn't know the car was as damaged as it was and was trying to continue.

Apparently, that's why the red flag took so long.

Sky Germany showed the full replay of him trying over and over again, did anyone manage to grab the replay of that?