This event scores 17.67 on constitutional damage (A) and 29.66 on distraction/hype (B), yielding D=-11.99, qualifying as List B. The A-score reflects genuine constitutional concerns: rule_of_law (3) for threatened federal override of local jurisdiction, separation (4) for potential military deployment in domestic law enforcement violating Posse Comitatus norms, civil_rights (4) for mass arrest threats targeting immigrant communities, capture (2) for federal coercion of local authorities, and violence (2) for militarization implications. However, this is PREPARATION for threatened actions, not actual implementation, triggering the 0.7 mechanism modifier for enforcement_action that hasn't occurred. Single-state scope applies 0.85 modifier. The B-score is elevated by Layer 1 factors: outrage_bait (8) for military deployment rhetoric and mass arrest threats, media_friendliness (9) for dramatic framing and visual potential, novelty (5) for federal-local confrontation setup, meme_ability (6) for 'troops in Chicago' imagery. Layer 2 shows mismatch (7) between threat level and actual occurrence, timing (6) for announcement-driven news cycle, pattern_match (8) for recurring immigration enforcement narratives. Intentionality indicators include threat_announcement, pre_action_publicity, polarizing_framing, and military_deployment_rhetoric (total 11), yielding 0.55 intent_weight that amplifies Layer 2 to 14.30. The event is primarily a threat/preparation generating significant media attention and political polarization without concrete constitutional violation yet occurring.