My roommate does the same!! She holds hand up out in front, palms in, and then.......stops. Nothing. Just hands stopped. And then slowly fall down.....And stopped again. Then held together like "pray" with hands moving slow back and forth because her brain stops.
Often I have no attention span and worse because she slows.so.much. to think of "perfect sign". So then I see stopped falling hands to "pray" and her face all 
or 
. Then my face is: 
We have many funny misunderstanding. Before my male roommate knew anything, he wants to know "go" sign. I show him - "go". Then he wants to know "come" sign. I show him - "come". No, he wants "come", not "go". I said "Yes. Sign for "go". Sign for "come"". He doesn't see different signs and thinks different word=different handshape I think. Then I think he understands, but he asks "How do you know a person means "go" or "come"?" My other (hearing) roommate who knows ASL some helped out - I gave up. "Direction makes signs different! Different direction so different sign different word....different........or something!" 
FredFam - great thread. Glad we have good discussion about "semantic inversion" 
