That's fine with me, realistically though, if I'm doing a serious dive with doubles, I'd more than likely also have stage. So I'm the event of a need to share air, once I'm above the mod, I'm switching to my deco gas regardless and they can have at it on the back gas. Otherwise I'd assume it's a relatively safe direct accent and wouldn't expect them to blow through half of the back gas before hitting the surface.In this case, because of your attitude toward your buddy, I would never be your buddy.
SeaRat
To each their own, it's not really an attitude towards a buddy as much as it is an attitude of self preservation, and realistically if they blew through the isolated tank and we were near the surface of course I'd make an attempt to save them as well, but it would really depends on circumstances.
Realistically a dive like that, most likely buddy and I have stage bottles, and my back gas just has to get us to the MOD of the deepest stage, which I presume would be relatively easy.