>> i thought first in a playful way like i'm going to get you. >> they disappeared up a partially built stairway and the young man reappeared carrying the young woman who looked to be limp in his arms. >> he jumped down and it was a turn and twist and he slammed here. >> and if he is wrong, everything changed. he watched from a distance as the man appeared to hide the woman's body in a section of the foundation. >> he made a opening in the cross under the foundation and he pulled the body inside of the crawl space and stayed inside for a minute or something and then came out and closed the gap. >> de jong knew he witnessed something but not until the news broke about natalee holloway that he knew. he couldn't go public. >> first understand there is a law that could punish me for