I'm with you on that.
Writing a game capsule or short story isn't rocket science. Most people could probably do it once they have a sense of the rhythm of games and a feel for the time with regard to deadlines. Dealing with the deadlines, knowing when/if to do things based on that, and how long to spend on everything, based on access, and your own experience/comfort level with such situations, is the most difficult part of stringing. And more experience helps with all of that.
There are also ways to help someone who struggles with stringing initially: Send them to daytime games if there are any. Additional weeks of shadowing/help at games is good. After deadline, go over the editing of whatever they turned in. Suggest the idea of "covering" college/pro games, right off the TV, for practice. In the comfort of their own home, they can keep/write out/compile running stats and get a feel for work pacing as if they were actually there. This can be very helpful, especially because they will have announcers calling play by play, and, if/when needed, explaining/clarifying rules and penalties and such. It can really help in connecting the dots and keeping up with the game, particularly if there is anything they don't know, or that they miss, without the pressure of "live" games.
This makes it so that they actually do learn, instead of panic. The stat-compiling (suggest they add them up at halftime, so that that much is done, at least, at the end of the game) will have them keeping up with the game, and getting a sense of it as they go, and will give them confidence that they can, in fact, be ready and able to write a straight roundup item or a short, featurized game story afterward.
Tell them to give themselves, say, between 15 minutes and a half-hour to actually do so. If they do that, they might even get some practice editing their own stuff, and realize they need it, again, all without real, "live" pressure, and will help them improve and gain confidence, knowledge and experience at writing/stringing for the actual paper (or web site).