One evening David got up from his bed and walked around on the roof of his palace. ¹  From the roof he saw a woman bathing. Now this woman was very attractive. ² 

So they pitched a tent for Absalom on the roof, ¹  and Absalom had sex with ²  his father’s concubines in the sight of all Israel.

Now David was sitting between the inner and outer gates, ¹  and the watchman went up to the roof over the gate at the wall. When he looked, he saw a man running by himself.