Strictly speaking, I'm not aware of any situation where transfusing alcohol into your veins could save your life, but for arguments sake, let's say it could.
If a doctor told someone to "abstain from alcohol" (for whatever reason) and that person suddenly found themselves in a situation where transfusing the alcohol into their vein would save their life, wouldn't it be absurd if the guy refused to do this because his doctor told that he shouldn't drink any alcohol, and subsequently died?
Yet that is exactly what Witnesses are taught to do. It's kinda like obeying the speed limit. If the speed limit is 50 km/hour (about 30 mph), in everyday life, you're supposed to generally obey it. However, let's say one night that you're driving out in the country and you come across someone who's severely injured on the side of the road. There's no hospitals close by and you know time is of the essence if this persons life is going to be saved. You bundle them into your car and you take off. You're going above the speed limit because someone's life is at stake and it's imperative that you get them to the hospital asap.
On the way, a cop sees you speeding and pulls you over. You quickly tell them what's happening and why you're speeding. The cop is not really sympathetic and while he can see that the passenger in your car is dying, he feels that it's a far greater sin to go above the posted speed limit than to try and save this person's life. The posted speed limit takes presedence over everything, even a person's life and if he dies because the cop is writing you out a ticket, oh well---too bad.
This of course, would be outrageous to anyone with 1/2 a brain, yet this is basically what JW's are taught. An obscure dietary law written thousands of years ago is viewed as being far more important than someone's life and if they die because of it---oh well too bad.
I really, truly wish that the assholes responsible for keeping this damn doctrine in place could spend a week with my sister and see the living hell that her life has become since my brother in law died in part due to the ban on blood transfusions. There are just no words for it and absolutely no justification.