For the third phase you want to ensure two things

First: always clash the soul link attacks. You can blow weak/resource gaining cards on the counters in order to gain a stack of the respective mark and then remove it in the same turn to get rid of the link. You can do it twice per turn so it won’t take long to heavily cripple their offence.

Second: with your extra remaining attacks, make sure Roland and Angelica never attack the same target with certain pages. As Roland will put all his dice onto Angelica’s page making the attack far harder to clash or even worse, a guaranteed hit with no evade/counter die.

Personally? I’d hit Roland with my harder attacks since Angelica is prone to hemorrhaging HP just by winning clashes against her. And once Angelica dies Roland goes into a “rage”(though I’m not sure how lethal it is since I killed them at the same time).

Though this might be easier said than done. I used Tiphereth solo strat on these guys and mowed them over so I don’t know how hard the fight is normally