First of all, before reading the reaction paper example, make sure you understand the purpose of a reaction paper. The purpose consists of three important elements. They are: to demonstrate that you have read/watched/listened to the assigned matter; to demonstrate that you have a clear comprehension of the assigned matter; and, to demonstrate that you are able to think creatively and critically, and draw a conclusion appropriately.
In everything else, your goal is to express your thoughts and prove them with the help of the assigned material. Look at a piece of a reaction paper example below.