1.4 million doeses given, 2000 recorded reactions, 400 or so anaphylactic and one death. Reactions are almost certainly under-reported but serious reactions are more likely to be reported, it's usually minor ones that aren't. If the reaction does what it is claimed there will be thousands of deaths avoided each year.
Offhand I don't know how many 14 year olds die unexpectedly each year and it would take too much effort to find out. But it's not unknown for teenagers to die of unrecognised heart problems. It's also possible that, as had been suggested, it was an anaphylactic reaction. It's possible it was not recognised as such initially and not treated promptly. Adrenaline doesn't aways work but something (most probably adrenaline followed by steroids) did for the other 400 cases. It works best if given promptly. This death may be as much a failure of medical care as a reaction to the vaccine.