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It's possible they gave him some medication that nobody knew he was allergic to and by time they caught it it was too late. It's also possible that someone fucked up and didn't read his chart before a procedure. Or it might be something completely different. I don't know if this'll help the fear, but this is one of those crazy random ways you can die and there's not a whole lot (aside from having an up to date and complete chart) that you can do about it. The only thing being afraid of it does is lower your quality of life.