Residential Tenancy and Memorandum of Lease are 2 different things.
Lease documents provides for earthquake, Lockdown, emergency, war, act of God etc beyond the control of the Tenant then rent can be suspended or not paid. PM declares state emergency (similar to war), so nz is basically rules by Police and Army.
If Police/Army orders killing that is under Order of War, can only be prosecuted in International Court of Justice.