I'm not really sure what happened either, but from what i got from this chapter is that they got greedy...?
It mentioned it in the end that things started getting messy because they wanted the spear...
They probably got angry because now they know Lee Sayoung also wanted the spear..
I guess in their desperate attempt at taking what they want, they all started attacking each other...
Ah, sorry.. did this go off-topic to the question...?

okz so, I've been re-reading the same three chapters for more than 30 minutes now, and I don't know if it's because I forgot something that was already stated before or if I'm just dense, ok let me cut to the chase, why did everyone in the auction get angry when Euijae raised the paddle?