It occurred to me that perfect parry and dodges on boss type enemies (tyrant, carnifex, hellbrute etc) produce headshot chances that can be interrupted and punished by subsequent attacks from the same boss while you are locked in a, at this point, way too long animation. 


Since these bosses have a tireless array of attacks, and that also have a huge deal of size, AoE and mobility, a roll or two might not be safe enough at all to take your shot: not only, but you might be put in such a situation that you will never be able to take that shot because they never ever ever stop and you might lose your window. 


The proposal would be to have a small time window after the perfect dodge/parry as a "boss stagger" that lets you break its attack pattern and exploit it for your hard earned free shot -save for external influences (like surrounding lesser mobs) that can still affect you.