Hopefully your "Technical Diver" buddy, knows how to buddy breathe.
I'm gonna go out on a limb here and suggest that any tech diver with even rudimentary tech training and skills (I'm talking about someone who's ACTUALLY a tech diver, not someone who's done 24 dives and then read on SB that he should buy a BP/W over the phone from Tobin.) will be able to buddy breathe with very little problem - even if they've never been trained to do so. It's really not that hard.
And if they DON'T know how to...they have the rest of their life to figure it out.
:shocked2: