How does Eliezer respond when his father is beaten for the first time? How does that response affect the way he sees himself? What does he fear is happening to him?

From long journey from Sighet to Auschwitz, Eliezer and his father has been put into concentration camp. They observe this huge devastating picture in this camp that they were shock that they couldn’t believe it was really happening. After Elizer and his father was put into a barrack, Eliezer's dad suddenly had a colic problem and he asked the Gypsy politely “Excuse me… could you tell me where the toilets are located?” his dad was severely beaten for asking that question. However, Eliezer stand watching his dad getting beaten, he just stood there as he never knew that person. Elizer feared that if he helped his dad he would go straight to chimney. Eliezer grew guilty that he couldn’t help his dad and so his remorse grew as well. He promises himself that “I shall never forgive them for this” (39) and he never forget this memory. 
Eliezer never wanted to be a person who abandon his own dad like his other friends in camp. He was feared that he was becoming like one of them and so he prays to god to help him never to lose hope on his dad. However later in the chapter Eliezer was relived when his farther died because he didn't have to look after him anymore.

http://www.sacred-destinations.com/austria/images/mauthausen/resized/ebensee-subcamp-5-7-45-usarchives-pd.jpg

Farther protecting his son from SS officer
http://www.themysticalpen.com/wp-content/uploads/2009/02/holocaust.jpg