Flashfreeze counters their red spells like Burst Lightning and any red creature spells, disrupting their aggressive tempo plan. Torpor Orb shuts off Eddymurk Crab's ETB tap trigger, slowing one of their few bigger threats. Bitter Triumph costs us life we can't afford against an aggressive deck, and Azure Beastbinder dies too easily to their efficient removal and cheap creatures, so we bring in more proactive disruption that doesn't cost life or tempo against their fast clock.