diff --git a/src/generator/shortspec.py b/src/generator/shortspec.py
index 3845b9e..0c2d073 100644
--- a/src/generator/shortspec.py
+++ b/src/generator/shortspec.py
@@ -159,6 +159,17 @@ when the source says "walnut shaped with a wide rim around its circumference" \
 — pick a shorter span that is still verbatim, or drop the quote marks and \
 state the fact plainly.
 
+**A quote field that takes a list of lines is ONE span, broken where it has to \
+break to fit.** It is not two quotes and not two slots to fill. Read the lines \
+back joined with a single space: that sentence is what the check looks for in \
+the sources, and what a viewer reads off the frame. Welding a real fragment to \
+a phrase from somewhere else produces a sentence nobody ever said — \
+"“LIKE ALUMINUM" + "SMOOTH, NO WINDOWS”" is a fabricated quote even though \
+every word of it appears in the material, because the witness said the first \
+half and a later writer summarising him said the second. Attribution makes it \
+worse, not better: the line under the quote names the person you just put \
+those words into.
+
 # 5. A worked example — FORMAT ONLY
 
 This is a case_file that produced a good video. Read it for shape: how long a \
diff --git a/tests/test_grounding.py b/tests/test_grounding.py
index 0068a96..ab13b35 100644
--- a/tests/test_grounding.py
+++ b/tests/test_grounding.py
@@ -122,12 +122,37 @@ def test_geometry_is_not_a_claim(spec):
 
 def test_a_split_quote_is_one_claim(spec):
     """scale_bars.quote son las líneas de UNA cita: se comprueba entera, no a
-    trozos (el renderizador no envuelve; el caller parte las líneas)."""
+    trozos (esas líneas las parte quien escribe el spec, no el renderizador)."""
     quotes = [c.text for c in extract_claims(spec) if c.kind == "quote"]
     assert "TWICE THE SIZE OF AN AIRCRAFT CARRIER" in quotes
     assert "TWICE THE SIZE OF" not in quotes
 
 
+def test_a_quote_welded_from_two_sources_is_flagged(spec):
+    """El fallo real del Short de Socorro: cada mitad existe, la frase no.
+
+    El modelo cogió un verbatim del testigo y le soldó la compresión de un
+    resumen posterior, todo dentro de unas comillas y con su atribución debajo.
+    Comprobar las líneas por separado habría dado las dos por buenas y publicado
+    una frase que nadie dijo — por eso la unión es la unidad de comprobación.
+    """
+    chunks = CHUNKS + [{
+        "url": "https://example.org/retelling",
+        "content": ("Terauchi called it “twice the size of an aircraft carrier”. "
+                    "Later writers described the contact as unlit and silent."),
+    }]
+    haystack = " ".join(c["content"] for c in chunks).upper()
+    assert "TWICE THE SIZE OF" in haystack and "UNLIT AND SILENT" in haystack
+
+    welded = json.loads(json.dumps(spec))
+    welded["shots"][3]["props"]["quote"] = ["“TWICE THE SIZE OF", "UNLIT AND SILENT”"]
+
+    report = check_grounding(welded, chunks)
+
+    assert [c.text for c in report.ungrounded if c.kind == "quote"] == [
+        "TWICE THE SIZE OF UNLIT AND SILENT"]
+
+
 # --- comprobación -----------------------------------------------------------
 
 def test_reference_spec_is_fully_grounded(spec):