Please don't misinterpret this as a "fixed-blades are better than folders" thread. That was not my intention. I just thought I'd share my friends story.
While it's true that the fixed-blade could have injured him during the crash, it's also possible that a ball-point pen in his pocket or the earpiece from the eyeglasses in his pocket, could have stuck him through the heart. But they didn't. I judge the story by what actually happened, not all the "what-ifs". In such a situation, the what-ifs are endless.
I can tell you the following, as he told me-
1. The impact of the crash caused his wallet and a can of Skoal to leave his pockets (he didn't have a chain wallet), it took a bit of searching to find his wallet. I'd imagine that a loose pocket knife in his pocket, even one clipped on, could have also been lost in such a manner.
2. He only had the use of one hand as the other was badly mangled.
3. He was bleeding to death and didn't have a lot of time to act.
Though he wasn't carrying one, he did own some folders, if he hadn't been carrying the Ka-bar, he would have been carrying a Buck 110 in a leather belt sheath. This incident happened back in the early eighties, before the modern era of one-hand folders. He also didn't have one of those "one-arm bandit" thumb-stud attachments for the 110.
After the accident, my friend had a proud affection for his Ka-bar, but not because it displayed any special abilities. It was the kind of proud affection that people take in objects that they used, or were used, to save their lives. My friend made it clear to me that under the circumstances, and in the condition he was in, that if he had to fumble with a folder instead of just pulling out the Ka-bar, that he likely would have bled to death before getting himself free.
We'll never know if the Buck 110 would have served him just as well in his time of need. All I do know is that the guy who had the experience told me that it wouldn't have.