I believe it's primary, because the person was there when it happened.
Some of the examples are listed below:
1) The prefix "Mac" means "son". "Mc" is an anglicized version that is used in Scotland and Ireland. It is patronym and the female equivalent is Nic. Example is Mackenzie.
2) Prefix fitz has the same meaning with suffix son which the former has been used from Norman times. Therefore, there are examples such as Fitzgerald and Fitzpatrick.
3) In Dutch language, are composed of the combination of father's name and ending. The suffixes are zoon for sons, dochter for daughters. For example, Janszoon and Simonsdochter.
Answer:
A water snake gliding in the pool is caught by a heron and eaten while its tail waves frantically, and a strong wind blows into the clearing and dies down.
Hope this helped you.