Duck's a civilian: an encumbrance, and a complicating factor. Staying clear of her is the sensible tactic. (For now, anyway.)

Trowa twists and moves in, to catch the kick on his thigh -- it'll bruise that way, but no worse -- and to grab at Duo's arm while he's on one foot.

Ideally, he'll manage a throw; if not, elbow strikes are always nice in close.

And Duo's face is at a nice convenient elbow height!