Inquiring minds want to know, so I plodded out to my Sentra and inspected the headrest. The twin prongs are nicely chamfered at a 45 degree angle (impeccable Japanese crafsmanship)- wouldn't want the owner to get any nasty gashes or cuts which could result in expensive lawsuits....
That may really depend on the pride the manufactures take in their product. I have seen some with a sharp edges too. Itīs a matter of manufacturing costs though.
"If it saves only a few people thatīll be enough" has a nice ring to it, but some sort of rescue tool will probably be far more effective. Rather than wrestling with my headrest, I am more likely to use the Phillips head screwdriver on my Leatherman tool. It will likely be far more accessible.
Itīs not intended as rescue tool. Some headrests cannot even be removed from an upright seat.