About Jaina's and Thrall's case, these events come from the book about Garrosh's trial. Basically Jaina used "Focusing Iris" to summon huge tidal wave made entirely from water elements to drown Orgrimmar, and Thrall was using all his power holding the wave back. So there's been no fight really in the book since Thrall was in no position to fight, but he was saved by Kalec when Jaina tried to kill him, that is true.

As for Skull, i think it simply homage to "Alas, poor Yorick".