AR (assistant referee) is a real job in most European countries. You have to become one, go to courses, seminars, training sessions etc. It's a different thing from being a centre referee. The AR used to be called lines man and before that, in important tournaments, the lines man used to be a centre referee himself, appointed by the organizing committee.
That didn't work well. Sometimes the ref with line duty thought he was better that the one in the middle and that he should have been there. More often than not, like during the World Cup, the three refs couldn't even communicate with each other, being from different continents.
Luckily that all changed.
AAR (additional assistant referee) is not a job, but a temporary thing. It's a different task from being an AR and from being a centre ref, but AARs are real FIFA centre referees albeit from a lower category. Some are on their way up to become the main man themselves.
I wonder what it feels like being an AAR. To have to be standing there for 90+ minutes, not doing much, being part and not being part, and you can't even run. Perhaps AARs consider it an honour to be part of the team in such an important tournament. Perhaps some think they are better than the one in the middle and that they should have been there.
And they were moved. At first the AARs stood on the other side of the goal, but since the referee is supposed to run a diagonal, the AAR and the ref would be watching from the same angle, so they moved them.
What happened with the Ukraine goal was that the expert, the AR, who's job it is to judge these things, couldn't see anything because UEFA put Istvan Vad in between him and the ball.
You can see our friend Istvan Vad watching very closely when the ball goes into the goal. I wonder if he was sure it didn't cross the line enough for it to be a goal or that he just wasn't sure what he saw and didn't dare to call it.
I hope that last one wasn't the case because we all want to see Istvan back in the centre and become an Elite Category ref and to become a good one it takes guts.
And we can't ask him, because referees aren't allowed to talk about the match (I really think that is ridiculous, ref boss Collina himself used to be in the news all the time, he even wrote a - extremely boring - book about himself).
Kassai is a Collina protege, so he probably works like the Italian. Collina used to know everything about the teams and players he was going to see. He read the papers, saw their other matches and passed it all on to his team in a session in front of a white board before a match.
Kassai's interpretation of the rules must have the ref boss' approval. The Hungarian does not necessarily follow the rules strictly: at first he lets play go on, see what happens. Players don't get booked immediately, but are warned first.
So what happened was that later on in the second half Kassai got more strict and towards the end he he pulled out his card for almost everything. This made him seem rather inconsistent. But who knows, maybe he had been adding fouls in his head until he finally had enough.
Anyway, the Hungarian team will probably go home.