USAU Southeast Mixed Regional Finals Injury Call

Can anyone explain what the hell the ruling is during the SE MIXED final? Toro vs. Roma. Universe point. Roma turns the disc over, Roma player calls injury, toro storms down the field, turns it, a toro player calls injury, initial injured ROMA player SUBS BACK ON for offense. Toro coach storms the field, yelling at the observers. Play resumes, initial injured ROMA player proceeds to turn it over. Toro scores on a half field huck, everyone storms the field and thought the game was over. Turns out there was a call 70 yards back for not checking the disc in? Observers uphold the call. Toro has to storm back down the field again, initial inured ROMA player gets scored on for the win. Wild environment. 4 observers, including Mitch. All shaking their heads at what just happened. 100’s of people watching the game, screaming from the sidelines, booing the allowed calls.