Ayrton Senna Heel-and-Toe

[gsuk1]

I'm sure all of us have already seen the video of Ayrton Senna driving a Honda NSX around Sazuka. Where he demonstrates he's awesome Heel-and-toe driving amongst other things. For those who haven't its here:

http://www.youtube.com/watch?v=8By2AEsGAhU

I'm familiar with Heel-and-toe and also familiar with the need to be as smooth as possible when track driving. So my question is why Senna 'flicks' the throttle mid corner after engaging the gear...

In the video this can be seen at 47seconds in.
He's done the heel-toe, engaged the gear but rather than smoothly squeeze the throttle on (as I was always taught to do) he flicks the throttle. Why would he do that? Surely this destabilises the car, compromising grip...

He does it again at 1m30s - perhaps the best example.
and 1m54s

Any ideas why he's doing this?

[gsuk1]

So from what I see the leading arguments are:

1) Spool up the Turbo.
2) Human traction control.
3) Cure understeer.
4) Diffuser efficiency - Seems unlikely on a Honda NSX.
4) He isn't driving very well - I think I'll put in the maybes.

Further thoughts...?