Fish instinctively know how to swim; most humans don't.
His grip tightened instinctively around her.
She dropped instinctively to the ground.
I started up and instinctively stretched out my hands.
Cautiously, she crept up to the door and peered around it, jerking her head back instinctively when she spotted Yancey unlocking a door to an inner office.
His shoulders hunched instinctively as he felt the eyes of the guards atop the walls on him.