One of the most important aspects of dungeon runs is interrupting important casts. Having a system in place to coordinate is key. I recommend making a binding a key to mark a mob. This will announce to the group that you are responsible to Zuschlagen
that marker. Try to not use skull, as this usually communicates the priority target to kill. Additionally I recommend a Weak Aura(addon) that will track group interrupts and allow you to cover other player's assigned spot. There are many available on wagio.io
like this one here
You can not press Zuschlagen
while channeling Klingensturm
. This Zuschlagen
macro below will cancel it and interrupt instead. This may not be optimal for damage, but will help your group not die.