Tigole posted an update today about some upcoming changes to the Cleave ability many monsters in the game use.
> The following changes to cleave have been made for the 2.1.0 patch. > > --Cleaves will only hit people in front of the creature. > --Cleaves will have a chain length equal to the combat reach of the creature. > > We still don't have an exact estimate on when this patch will be ready but development is wrapping up and the test phase should begin relatively soon. As a reminder, the patch undergoes internal testing before public, PTR testing