feedback5 CB2: the countdown summons (医疗探机, 诅咒娃娃, 海嗣; 自选 工程蓄水炮, 沙地兽, 打字机, 本能的召唤) take no damage — 活性源石 included —, are never healed, and their bar shows the life left (community report of 2026-10-06 「赫默的无人机、浊心斯卡蒂的海嗣等这种召唤物不会受到外来伤害…血量随时间减少」)

Official: PRTS 斯卡蒂的海嗣 备注 「持有禁疗、无敌」, the token prefabs of 海嗣 and 沙地兽 carry abnormal flags 5 + 7 (无敌,
禁疗), 工程蓄水炮 7 (禁疗); the report describes the official mode for the drone too — [ASSUMED] 无敌 + 禁疗 for the summons
the base prefabs give no flag (医疗探机, 诅咒娃娃, 打字机, 本能的召唤), and the bar as a timer.
Cause: content/tokens.js / the kits only made them untargetable: a 海嗣 on 活性源石 lost 70 of its 100 HP every second, a
hurt drone drew every medic's heals, and the bar was plain HP. Now: COUNTDOWN_SUMMONS / startCountdown (called where each
lifetime is scheduled: tokens.js scheduleLifetime, 浊心斯卡蒂, 温蒂, 莱伊, 鸿雪, 酒神 kits) give 无敌 + 禁疗 and
Unit.countdown; snapshot.js sends hp = maxHp × the share of the life left (the sim HP stays full, so no selector sees a
low-HP summon). Attacked summons (沙之碑, 狼群 …) are unchanged. The 吟游者 trait therefore cannot refill such a bar (item 32).

Golden: snapshot hashes only (the bar) — roster-003, -016, -018, -035, -045, -046, bond-visiShip-low / -high,
boss-boss_1 / 3 / 5 / 7-pair, unite-1; gameplay too — roster-005 (medics no longer heal the drone), roster-037 and
hidden-boss_9-pair (a 海嗣 / drone under enemy and leader damage stays up: fights change).
Tests: test/sim/feedback5-countdown-summons.test.js (7; fails on the parent: no COUNTDOWN_SUMMONS — and there the 海嗣
lost 70 HP to an 活性源石 tick). Docs: SIM.md token pieces, PLAYING.md 作战中.

server/sim/snapshot.js

@@ -1,6 +1,7 @@
 // server/sim/snapshot.js — compact serialization for clients (DESIGN §8.2).
 //
 // b.snap  = { fieldId, t, units: [[id, x, y, hp, maxHp, sp, spMax, flags, anim]], dp, killed, total }
+//   (hp of a countdown summon — unit.countdown, content/tokens.js startCountdown — is maxHp × the share of its life left)
 // UnitInfo = { id, kind, side, ownerId, defId, name, tier, golden, spine, avatar, x, y, facing, dir, maxHp, motion?, boss?, uid?,
 //   form?, skillIndex?, moduleId?, items?, standInFor?, diy? }  (standInFor = the replaced operator's charId of a 补位
 //   stand-in; diy = a 自选 piece's pick { charId, skillIndex, uniEquipId } — defId is its slot, spine / avatar the operator's;
@@ -107,9 +108,13 @@ export function unitTuple(u, t) {
       sp = spMax * (sk.timeLeft / sk.duration);
     }
   }
-  // hp is rounded up (a living unit never shows 0) but never above the rounded max HP
+  // hp is rounded up (a living unit never shows 0) but never above the rounded max HP. A countdown summon (医疗探机, 海嗣 …:
+  // content/tokens.js startCountdown) shows the share of its life left instead — its bar runs down like a timer and it
+  // leaves when it is empty (community report of 2026-10-06; its HP itself never moves: 无敌, 禁疗)
   const maxHp = Math.max(1, Math.round(u.s.maxHp));
-  const hp = u.alive ? Math.min(Math.max(1, Math.ceil(u.hp)), maxHp) : 0;
+  const cd = u.alive ? u.countdown : null;
+  const left = cd ? Math.max(0, Math.min(1, (cd.until - t) / Math.max(1e-9, cd.until - cd.from))) : 1;
+  const hp = u.alive ? Math.min(Math.max(1, Math.ceil(cd ? maxHp * left : u.hp)), maxHp) : 0;
   return [u.id, r2(u.x), r2(u.y), hp, maxHp, r1(sp), spMax, flagsOf(u), animOf(u, t)];
 }