Do you know if they did anything to mitigate replay attacks? If not, you could potentially capture someone's first call-hope and replay it until they fail. Pre

Do you know if they did anything to mitigate replay attacks? If not, you could potentially capture someone's first call-hope and replay it until they fail. Presumably no one would want to, but people still like messing with one another for fun. Also, if you discover a vulnerability like that, you could plausibly claim that someone exploited it to bomb your grade, particularly if you used it against a bunch of people.