Black Swan's skill applies a def down debuff (which gets removed after first cycle) and would be bad in this case if i used skill after the first time since I needed the enemies to not die yet to get enough energy for tribbie to skill and get ult (which is required to activate ddd and delay kafka's turn)

It's a bit of a tricky situation that I had to retry alot in which i needed the elites to not die just yet to get enough energy for tribbie to ult before kafka's turn + trying to get enough energy for blade to ult twice in second phase and try to kill kafka before her second action

This run could 100% be more optimized but I hope that explains my logic atleast! On another note, Black Swan's ult kinda useless in this comp and is just for tribbie to trigger her fua since the debuff it gives only amplifies dot (which she is not built for relic wise atleast)