Answer prose round 1: name the parent after .., mark the step down as the one exception to the shared draw, and plainer errors

draws.go

@@ -5,7 +5,7 @@ import "strings"
 // drawMemo is what a hold, a draw group or a named pick has drawn: the variant each level was
 // drawn as, so every path under it reads one variant; the value each read produced, by its path,
 // so the same read written twice reads one value; the frames a read opens for the name
-// scopes around where it lands (enter); and the rows drawn below each step up stepped down from.
+// scopes around where it lands (enter); and the rows drawn by each step down after a "..", by level.
 type drawMemo struct {
 	variant       map[string]node
 	value         map[string]readValue
@@ -13,8 +13,8 @@ type drawMemo struct {
 	steppedDown   map[string]*pinSet
 }
 
-// stepDownPins is the pins a path steps down into after stepping up to t, at the level at: kept
-// in m where there is one, so every path stepping down there reads one draw.
+// stepDownPins is the pins a path steps down into after stepping up to t: kept in m where there
+// is one, so every path stepping down there reads one draw.
 func (m *drawMemo) stepDownPins(pins *pinSet, t *table, levels []string, at int) *pinSet {
 	if m == nil {
 		return pins.above(t)