He didn't see her until she was close enough to touch his arm.

She reached out to touch his arm, and felt him take her hand.

He used his free hand to touch my arm, and that was all we needed.

He looked up and reached out to touch his father's arm.

I touched her arm before she could move past me.

She touched my arm and I turned to look at her.

I touched his arm and he looked down at me.

Her hand had reached out, and he felt it touch his arm.

He touched her arm before she could open the door.

Now it was his turn to reach out and touch her arm.