This is what Glock himself had to say:
"I was on dry tyres at the end of the race when it was raining quite badly and it was just impossible on the last lap,” explained Glock.
I was fighting as hard as I could but it was so difficult to just keep the car on the track and I lost positions right at the end of the lap.
“Finishing in the top six is a decent result for me because I'd been struggling with the car earlier in the weekend but we were very close to fourth place so I am a bit disappointed.”
We must give some credibility to the man and believe him.