.... it says he was "sent" by a professor to the clinic... does that mean he wasn't going to go himself? Or, was an ambulance called by the professor to get him there?
This would be one of those things to think about for how a reaction is handled..... like would your kid actually be able to handle an emergency on their own if necessary? Administering an epi-pen to themselves and calling 911. Or, would they try to get through a reaction, waiting .... and then going to a clinic only after being told to go?
Part of this could be the 'brain fog' that sometimes come with a reaction. When I was living at camp as an outdoor ed director, I had an unexpected reaction - how I eventually found out I was allergic to saffron. It was during the off-season, so I was at home alone. It completely made sense in my head to get into my car with my portable neb and drive to the urgent care in the nearest town. It wasn't an 'I don't know what to do' situation, it wasn't a 'I'm not sure it's that bad' or 'let's see if this gets any worse situation', I was kind of out of it, and my brain legitimately was telling me that was the logical, 'right' thing to do.
To give perspective - this was a really horrible idea. It required me to drive myself on winding country roads for 15 minutes into a small town that had no hospital, only urgent care. Now, their urgent care was a little more equipped than most, since the nearest hospital was an additional 45 minutes from there, but still, this was a spectacularly poor choice. I drove, portable neb going the whole way, and parked. As soon as I got out of the car, I was hit by the impending doom/I'm going to die very, very soon feeling. I went in, skipped the sign in and wandered over to the check in, where I told them I thought that I was having an allergic reaction. By that point, I was apparently looking pretty bad - slightly swollen, wheezing audibly, lips and fingernails turning blue, etc. I was in their 'crash room' in less than two minutes, hooked up to monitors, epinephrine given, starting IVs for other stuff. (I have to say, for an urgent care, they MOVED when stuff went bad.)
Everything turned out fine, but in that case, it wasn't really even that I was making a poor choice - it was that I wasn't able to choose at all. My brain didn't even consider it to be a choice really - it was just like, "Hey, the logical thing to do here is to take yourself to urgent care. Do that." Like autopilot of bad ideas, if you will.
Now I don't have an answer for how you plan around not being mentally able to execute your emergency plan, since there aren't really a whole lot of ways to plan for that. But I think one thing to consider when you are teaching kids/young adults to make responsible choices with reactions, is that they need to keep in mind that it is possible that when it happens, you won't be able to make those choices. Which means that it is super important to make sure that you are not surrounding yourself with people that you can't trust. It probably wasn't the first time that the other people in the fraternity did something sketchy, and it isn't necessarily fair that severely allergic people need to be extra cautious about it, but it's just a reality in keeping yourself safe.