rotating a BLine object

I’m about to give up! Watching the flower animation, using the rotate tool to rotate a BLine object seems easy. Except that I can’t do it with my animation (a rectangle-shaped BLine). Every time I grab a vector with the rotate tool, the object distorts. What am I doing wrong?

Be sure that you’re watching and selecting all the ducks (the vertices and the tangents ducks) then once selected (they become highlighted) you can drag one of them and the rest will act depending on the tool you have chosen (normal, rotate, scale, smooth and mirror)

If the tangent ducks are not shown (use ALT-3 to toggle its visibility) they cannot be manipulated by any tool (although the still being selected but hidden).

-G … tangles.3F