Only as a result of Yumi loudly contending the cards. The other troubles Chihaya was suffering are her own faults or a part of her own character. I have complained about them earlier. It's not just losing the cards (rightfully or wrongfully), but for most people, especially since they are Japanese people, rudely disturbing other people's games might be a mental shock. I do blame Yumi for that. If Chihaya, or anybody, becomes afraid every close call will bring about a noisy debate, it will prevent them from playing smoothly.
Dunno, I'm the kind of person who staid rock silent during lectures. I did have some friends who occasionally talked during them, and while I barely ever answered them, I still felt ashamed to be a part of the incident, even though I was only a person someone else talked to.
From justice's point of view there's certainly nothing wrong about contending cards rightfully, but you have to read the atmosphere and the situation. And like I said before, well in the middle of the game, both the players should equally lose cards like that, unless one of them is a cheater. If both are honest, it's nobody's loss, statistically. So, they could let it slide, in order to let other people enjoy their own games.