He held on as the boy's other hand flailed against him.
His hands no longer flail the air quite so much when he speaks.
His hands flailed through the air but failed to get a grip.
The slipstream caught him and his hand flailed, then he was gone.
A huge meaty hand flailing about closed on her shoulder.
Her hands flailed at the air to steady herself.
The old guy stopped, one hand on his bike, the other one flailing around.
Miniature hands and incredibly small feet flailed the chilly air.
There I was, one hand flailing free and the other letting go of my grip on the tether.
He howled in pain, and his hands flailed the air helplessly.