What's The "pick"?

[piebaldpython]

http://www.youtube.com/watch?v=4SR-Cvdt_LU
NOOB here with a question. See the clip above of DogHouseDave playing slide. Some parts he fingerpicks (bare) with thumb/index/middle fingers and others he seems to hold thumb/index finger together ala Stephen Stills. When he does that, is he using the index finger (tip) or the side of his thumb as a pick?? Inquiring minds wanna know. Thanks!!!

 

[Katastrophe]

It looks like he's using his index finger to me.

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