I can describe the main culprit quite easily - young chap about 6'4'' with one of those trendy stubbles. Seemed to be one of their coaching staff, was on edge all game and couldn't sit down. Completely lost it at the end using vile abuse and threatening toward the dressing room area (couldn't see who) as we left the building. Seconds later it had spilled out front with fists flying but we were 100 yards away from the "action" by then. Completely unacceptable and all provoked by the ref adding on what he felt was unfair additional time during which (inevitably) they conceded.