Rugosa map boss (Siren) needs to have her phases cut out

Phase where she goes in centre hole and does the petrifying spinning thingy.
It's cute and all during the campain but we can't have that twice per fight in the endgame.
Either cut it out entirely or make it happen only once per fight.
Sure there's some eye candy in there but really we don't got time for two 45 second invincibility phase on a simple map boss.
Just no. Please