i also think that this trick involves some kind of pass, but as mentioned above you can achieve a similar but in my opinion even better effect with dan and daves "hedgebergs peak" which is also available on the trilogy and the two locations mentioned above.
one of my favourite tricks at the moment by the way ;-)
Looks like the "Braue Reversal" that Brad Christian teaches in World's Fastest Card Trick. I say it in inverted commas because other sources have lead me to believe that what he calls the Braue Reversal is in fact not that at all...
It's not a pass really if it's what I think it is.
If the object is to reverse the bottom card to the top, then its very similar ( and inferior ) technique to a reversal explained in Expert Card Technique, the name escapes me, but its done in the act of overhand shuffling the deck, which covers the sound.
In this video, the card will be heard from a mile, let alone that the angle is extremly forgiving.
I checked the Card College and this deck turnover reverse is basically what I'm doing. My technique is to make a big buckle ( the card has a "U" shape) and a really fast turn. Plus it can be done with the cover of the second finger so you won't see the card from the front.