Deepwoken - Trial of One Lesser Angels

The Lesser Angels are more or less a parry check before the actual parry check. They use the same moveset as the basic spear npcs such as the trainer from vigil.
They'll try to back away from you and that can make it difficult to start a parry trade with them. If this happens keep moving toward them until they attack you. Parry that and begin parry trading.

For the ranged moves treat it like the orbs at the start. Spam parry after the first one is parried.
Beyond that there's not much else in advice that I can give. If you miss a parry keep calm and let them hit you once before you try and parry again. With how the parry system is now trying to spam parry the next one will just get you locked in a pattern of missing and being hit.