Here's a brief interview with Robert after the Werchter show, though it appears to be region locked.
Update: looks like the clip has been removed, but I asked Vicky about what he said in it: "I remember he said he played every festival gig pretending the
audience would have never heard of them. And that it’d been a long time
he’d been so hot on stage, he was dripping with sweat from the moment he
walked on (and yes, that was rather clear to see on the big
screen close ups. and he wasn’t alone, it was SO hot and humid! Very
un-Belgian weather)." (Thanks Vicky)