diff --git a/narwhals/dataframe.py b/narwhals/dataframe.py
index 2406cbecf8..87ec52ef50 100644
--- a/narwhals/dataframe.py
+++ b/narwhals/dataframe.py
@@ -20,7 +20,6 @@
     from narwhals.group_by import GroupBy
     from narwhals.series import Series
     from narwhals.typing import IntoExpr
-    from narwhals.typing import T
 
 
 class BaseFrame:
@@ -208,7 +207,7 @@ def to_dict(self, *, as_series: bool = True) -> dict[str, Any]:
 class LazyFrame(BaseFrame):
     def __init__(
         self,
-        df: T,
+        df: Any,
         *,
         implementation: str | None = None,
     ) -> None:
diff --git a/narwhals/pandas_like/dataframe.py b/narwhals/pandas_like/dataframe.py
index 41babe4af7..32dc9ae753 100644
--- a/narwhals/pandas_like/dataframe.py
+++ b/narwhals/pandas_like/dataframe.py
@@ -103,7 +103,7 @@ def filter(
         # Safety: all_horizontal's expression only returns a single column.
         mask = expr._call(self)[0]
         _mask = validate_dataframe_comparand(mask)
-        return self._from_dataframe(self._dataframe.loc[_mask])
+        return self._from_dataframe(self._dataframe[_mask])
 
     def with_columns(
         self,
diff --git a/narwhals/pandas_like/utils.py b/narwhals/pandas_like/utils.py
index 7f0351003e..9c3d25ee43 100644
--- a/narwhals/pandas_like/utils.py
+++ b/narwhals/pandas_like/utils.py
@@ -60,12 +60,6 @@ def validate_dataframe_comparand(other: Any) -> Any:
     from narwhals.pandas_like.dataframe import PandasDataFrame
     from narwhals.pandas_like.series import PandasSeries
 
-    if isinstance(other, list) and len(other) > 1:
-        # e.g. `plx.all() + plx.all()`
-        msg = "Multi-output expressions are not supported in this context"
-        raise ValueError(msg)
-    if isinstance(other, list):
-        other = other[0]
     if isinstance(other, PandasDataFrame):
         return NotImplemented
     if isinstance(other, PandasSeries):
@@ -73,6 +67,12 @@ def validate_dataframe_comparand(other: Any) -> Any:
             # broadcast
             return item(other._series)
         return other._series
+    if isinstance(other, list) and len(other) > 1:
+        # e.g. `plx.all() + plx.all()`
+        msg = "Multi-output expressions are not supported in this context"
+        raise ValueError(msg)
+    if isinstance(other, list):
+        other = other[0]
     return other
 
 
diff --git a/tpch/q1.py b/tpch/q1.py
index 965069548a..e634cec47b 100644
--- a/tpch/q1.py
+++ b/tpch/q1.py
@@ -39,9 +39,7 @@ def q1(df_raw: Any) -> Any:
     return nw.to_native(result.collect())
 
 
-df = pd.read_parquet("../tpch-data/s1/lineitem.parquet", dtype_backend="pyarrow")
-breakpoint()
-# df["l_shipdate"] = pd.to_datetime(df["l_shipdate"])
-print(q1(df))
-df = polars.scan_parquet("../tpch-data/s1/lineitem.parquet")
+df = pd.read_parquet(
+    "../tpch-data/s1/lineitem.parquet", dtype_backend="pyarrow", engine="pyarrow"
+)
 print(q1(df))