Shirk has so many uses, this has probably been said before but this is how I use it:

1.) makes tank swaps really easy (not that it was ever hard)
2.) in the example of Lakshmi ex when im OT I can shirk the MT then voke to guarantee I have 2nd most hate by a large margin.
3.) when im OT and no tank swaps necessary, you can voke then shirk the MT so the MT never has to enter tank stance short of heavy tankbusters (as a DRK when im MT I wish more OTs did this as everything outside damage combos is a big dps nerf)