So about the Hamilton / Grosjean incident...
I just watched QF again on the CH4 broadcast and from what I can tell, Hamilton was just about to go onto a hot-lap, whereas Grosjean already was. They met at the very end of the track, at the point where Hamilton was just about to go on full throttle.
I suppose when a driver would be on an slow lap (e.g. after a hot-lap and about to go into the pits) and impedes a driver who is on a hot-lap, it's a black/white offense. In the above case however, Hamilton wasn't on "the lap" yet, but he was just about to go "on it" at the point at which Grosjean caught up. From what I can gather; if Hamilton had slowed and went off-line, he would have compromised his own "hot-lap".
Now, this isn't a post to defend Hamilton etc. It's more about the question if this line of thinking could have been considered by the stewards when they looked at the incident? Is there a clear rule at what point a driver is deemed to be "on it" and doesn't have to yield? Does the part before the lap starts count as well?
In theory - what would happen if two drivers are "on it" and on a "hot lap" and meet on track? I.e. if a slower Sauber is on a hot lap and the Mercedes catches it mid lap? I guess that's just tough luck, isn't it?