Stone to water splashes like it means it

The transmutation fired no flourish: its event carried no coordinates
for the wall case and the mapper knew neither it nor the wave it
raises. The event now carries its edge; the burst splashes both sides
of the vanished wall (or the freed square, for a block), and every
wizard the collapsing wave carries leaves a wash streak — which also
gives the plain WATERWALL's wave its motion for free.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/engine/src/game.ts

@@ -540,7 +540,7 @@ export type GameEvent =
   | { type: "safeCreated"; caster: PlayerId; at: Cell }
   | { type: "safeOpened"; player: PlayerId; at: Cell }
   | { type: "itemsTraded"; caster: PlayerId; a: Cell; b: Cell }
-  | { type: "stoneTurnedToWater"; caster: PlayerId; at: Cell | null }
+  | { type: "stoneTurnedToWater"; caster: PlayerId; at: Cell | null; edge?: { cell: Cell; side: Side } }
   | { type: "handsSwapped"; a: PlayerId; b: PlayerId }
   | { type: "handsScrambled"; caster: PlayerId }
   | { type: "rammed"; attacker: PlayerId; target: PlayerId; distance: number }
@@ -1730,7 +1730,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
         if (!losToEdge(view, caster.position, cell, side)) return "no line of sight";
         state.edgeOverrides[key] = "open";
         delete state.createdEdges[key];
-        events.push({ type: "stoneTurnedToWater", caster: caster.id, at: null });
+        events.push({ type: "stoneTurnedToWater", caster: caster.id, at: null, edge: { cell, side } });
         // "Wall turns into a WATERWALL with a range and damage of 2."
         waveFromEdge(state, events, cell, side, 2);
         checkVictory(state, events);

packages/web/src/fx.ts

@@ -159,6 +159,27 @@ export function fxForEvents(
         push({ kind: "edge-dust", cell: e.edge.cell, side: e.edge.side });
         beat++;
         break;
+      case "stoneTurnedToWater": {
+        // The wall (or block) bursts into water: splash both sides of the
+        // vanished edge, or the freed square itself.
+        if (e.at) {
+          push({ kind: "splash", at: e.at });
+        } else if (e.edge) {
+          const n = {
+            x: e.edge.cell.x + (e.edge.side === "E" ? 1 : e.edge.side === "W" ? -1 : 0),
+            y: e.edge.cell.y + (e.edge.side === "S" ? 1 : e.edge.side === "N" ? -1 : 0),
+          };
+          push({ kind: "splash", at: e.edge.cell });
+          push({ kind: "splash", at: n }, 120);
+        }
+        beat++;
+        break;
+      }
+      case "washedBack":
+        // The collapsing wave carries them: a streak per victim.
+        push({ kind: "streak", from: e.from, to: e.to });
+        beat++;
+        break;
       case "died": {
         const at = posOf(e.player);
         if (at) { push({ kind: "soul", at }, 250); beat++; }