okay, after a closer look it says "multiple targets" on every combo except Knight/Priest - Knight/Priest has an elite skill which modifies this and reduces the CD to 30s. Still it does only ST damage on every combo.
Atleast the Shield of Discipline really DOES mitigate both physical and magical damage, although the tooltip from the official patchnotes states differently on EN AND DE. And the EN ingame tooltip says "magical damage and magical damage" , yeah