Here is the latest report, including the Sherpa's viewpoint:

www.explorersweb.com: Everest 2013: The Sherpas Viewpoint

Apparently, the three European climbers, who were acting independently, decided to ignore the Sherpa's requests not to climb above or near the rope fixing operation. The Europeans then stepped over the fixed line the Sherpa's were installing, angering the Sherpa's. After the Sherpa's descended back to Camp 2, Ueli decided to continue fixing the line the Sherpa's had abandoned.

Several points:

The European climbers disregarded the safety of the Sherpa team. One report indicates that ice was dislodged by the Europeans, which struck one of the Sherpa's below. There is a lesson for MWMR climbers here: be careful not to create a situation where accidentally dislodged rock will strike climbers below.

The Sherpa's were doing their job, following instructions and agreed upon directions by all the expeditions...except apparently, by the three European climbers. Ueli's decision to continue fixing the lines, the Sherpa's paid job, probably angered the Sherpa's even more.

Ego generated anger on the part of Moro really stirred the pot at Camp 2.

The Sherpa's have no ego involvement in climbing any Himalayan mountain; they work and guide in order to provide financial income for their families. That is the only reason they risk their lives to guide and prep routes on Everest, so that ambitious climbers can say "they" climbed Everest. Otherwise, the Sherpa people would not set foot on those peaks.